reflex angle assessment by Murphys lesson design studio | TPT - Free Printable

The worksheet asks students to color geometric figures based on a color code for three types of angles:
1. Reflex angle (greater than 180° but less than 360°)
2. 1st Reflex (This is likely a typo in the original worksheet and refers to a standard Obtuse angle, which is greater than 90° but less than 180°, or possibly just "Reflex" vs "Acute/Right". However, looking at the symbols:
* The first symbol shows an arrow curving all the way around the outside (reflex).
* The second symbol shows a standard angle arc (likely Obtuse or just a generic angle > 90).
* The third symbol shows a right-angle square mark (90°).

Let's look closely at the "Color Code" legend at the top right:
* Symbol 1: An arrow curving widely around a vertex. Label: Reflex. (Angle > 180°)
* Symbol 2: A simple curved arc between two lines. Label: 1st Reflex (This label is confusing. In many elementary worksheets, this position usually holds "Obtuse" or "Acute". Given the visual of a wide open angle, it represents an Obtuse angle (90° < x < 180°). Let's assume the label meant "Obtuse" or simply a non-reflex, non-right angle that is wide.) *Correction*: Looking at the text again, it says "1st Reflex". This might be a specific curriculum term, but visually it corresponds to the wide angles that aren't full reflexes. Let's treat it as Obtuse/Wide Angle.
* Symbol 3: A square corner symbol. Label: Right Angle (implied by the square symbol, though the text is cut off or blurry, the symbol is universally a Right Angle). Wait, looking closer at the third symbol in the legend... it looks like a right angle symbol.

Actually, let's re-read the legend carefully based on standard geometry worksheets.
* Top icon: Arrow going around the back. Text: Reflex.
* Middle icon: Standard angle arc. Text: Obtuse (The text "1st Reflex" is very strange. It might be a misprint for "Obtuse"). Let's look at the shapes.
* Bottom icon: Square corner. Text: Right Angle.

Let's classify the 20 items in the grid (4 columns x 5 rows):

Row 1:
1. Shape: Angle with arc showing >180°. Type: Reflex.
2. Shape: Wide angle (>90°, <180°). Type: Obtuse (matches middle legend icon).
3. Shape: Straight line with a point? No, it's a straight angle (180°) or just a ray. Wait, looking at item 3, row 1: It's a horizontal line with a dot. This might be a trick or a "Straight Angle". But usually, these worksheets stick to Acute, Right, Obtuse, Reflex. Let's look at the legend again. The middle legend item has an arc. Item 3 Row 1 has no arc. It might be ignored or classified differently. *Re-evaluating*: It looks like a ray starting from a point. Maybe it's not an angle to color? Or maybe it's a "Straight Angle"? Let's assume the task focuses on the marked angles.
* *Correction*: Item 3, Row 1 is a line segment with a endpoint. It doesn't show an angle arc. It might be a distractor or I am misseeing it. Let's look at the others first.
4. Shape: Angle with square corner mark. Type: Right Angle.

Row 2:
1. Shape: Angle with arc >180°. Type: Reflex.
2. Shape: Wide angle. Type: Obtuse.
3. Shape: Two rays meeting. The angle inside is small (Acute). The angle outside is Reflex. There is no arc marking. Usually, unmarked angles default to the interior. Interior is Acute. Is "Acute" in the legend? The legend has "Reflex", "1st Reflex" (Obtuse?), and "Right". There is no Acute symbol.
* *Hypothesis*: Maybe "1st Reflex" means Acute? No, the icon is wide.
* *Alternative*: Maybe the worksheet only wants us to color the ones that match the legend?
* *Let's look at the legend text again*. "Reflex", "1st Reflex", "Right Angle" (implied).
* Actually, could "1st Reflex" be a typo for "Obtuse"? Yes.
* What about Acute angles? If there is no color for Acute, maybe we don't color them? Or maybe the middle icon *is* Acute? No, the middle icon in the legend clearly shows an angle wider than 90 degrees.
* Let's check Row 2, Item 3 again. It's an acute angle. If there's no code for it, leave it blank?
* Let's check Row 2, Item 4. It's a quadrilateral with one angle marked as Right (square). Type: Right Angle.

Row 3:
1. Shape: Parallelogram/Trapezoid. One angle marked with arc. It looks Obtuse. Type: Obtuse.
2. Shape: Triangle. One angle marked with arc. It looks Obtuse. Type: Obtuse.
3. Shape: Two rays. Angle is Acute. No mark.
4. Shape: Circle with lines. Angle marked with square. Type: Right Angle.

Row 4:
1. Shape: Acute angle. No mark.
2. Shape: Angle with arc >180°. Type: Reflex.
3. Shape: Angle with square mark. Type: Right Angle.
4. Shape: Triangle. One angle marked with arc. Looks Acute? Or is it the exterior? The arc is inside. It looks like an acute angle. Wait, looking at Row 4 Item 4... it's a triangle with an altitude. The angle at the bottom right is marked. It looks like a Right Angle actually, but drawn slightly tilted? No, it has an arc, not a square. It looks Acute.
* *Self-Correction*: Let's look really closely at the legend.
* Legend 1: Reflex (Arrow around back).
* Legend 2: "1st Reflex". Icon is an obtuse angle.
* Legend 3: Right Angle (Square).
* There is NO code for Acute angles.
* Therefore, any shape showing an Acute angle (interior < 90) should probably be left uncolored, OR the "1st Reflex" label is a massive typo for "Acute" and the icon is misleading? Unlikely. Icons usually match.
* Let's assume the student needs to identify: Reflex, Obtuse (labeled 1st Reflex), and Right.

Let's refine the classification based on visual evidence:

* Legend:
* Reflex: Arc goes around the outside (>180°).
* "1st Reflex" (Obtuse): Standard arc, wide opening (90°-180°).
* Right Angle: Square symbol (90°).

* Grid Analysis:
* R1C1: Arc goes around outside. -> Reflex
* R1C2: Wide angle, standard arc. -> Obtuse ("1st Reflex")
* R1C3: Line with dot. No angle formed/marked. -> None / Skip
* R1C4: Square symbol. -> Right Angle
* R2C1: Arc goes around outside. -> Reflex
* R2C2: Wide angle, standard arc. -> Obtuse ("1st Reflex")
* R2C3: Acute angle (sharp). No mark. -> None / Skip (No code for Acute)
* R2C4: Quadrilateral. Corner has square symbol. -> Right Angle
* R3C1: Quadrilateral. Corner has standard arc, looks wide. -> Obtuse ("1st Reflex")
* R3C2: Triangle. Top angle has standard arc, looks wide (>90). -> Obtuse ("1st Reflex")
* R3C3: Acute angle. No mark. -> None / Skip
* R3C4: Circle/Crosshairs. Angle has square symbol. -> Right Angle
* R4C1: Acute angle. No mark. -> None / Skip
* R4C2: Arc goes around outside. -> Reflex
* R4C3: Angle has square symbol. -> Right Angle
* R4C4: Triangle. Bottom right angle has standard arc. It looks roughly 90 or slightly less. Given the other options, if it's not square, it's likely meant to be Obtuse or Acute. Visually it looks like an acute angle in a right-triangle setup (altitude). But wait, if I have to choose a color... maybe it's considered Obtuse? No, it's definitely < 90. I will classify as None/Skip unless "1st Reflex" covers everything non-reflex/non-right? No, the icon is specific. I'll stick to: Only color if it matches the 3 symbols.
* R5C1: Triangle. Bottom left angle has arc going around outside? No, it's a standard arc inside. Looks Acute. -> None / Skip
* R5C2: Ray/Line. Acute angle relative to horizontal? No mark. -> None / Skip
* R5C3: Angle with arc going around outside (Reflex). -> Reflex
* R5C4: Circle sector. Angle has standard arc. Looks Obtuse? Or is it a reflex angle drawn weirdly? The arc is inside. It looks like ~135 degrees. -> Obtuse ("1st Reflex")

Summary for the Student:
Since I cannot physically color the image, I will provide a guide telling the student exactly which shapes correspond to which label in their legend.

Labels to use:
1. Reflex (The one with the big arrow looping around)
2. "1st Reflex" (The one with the wide V shape - technically called Obtuse)
3. Right Angle (The one with the little square box)

Step-by-Step Guide:

* Color REFLEX (Big loop arrow):
* Row 1, Box 1 (Top Left)
* Row 2, Box 1
* Row 4, Box 2
* Row 5, Box 3

* Color "1st REFLEX" / OBTUSE (Wide V shape):
* Row 1, Box 2
* Row 2, Box 2
* Row 3, Box 1 (The slanted rectangle/parallelogram corner)
* Row 3, Box 2 (The top of the triangle)
* Row 5, Box 4 (The pie slice shape)

* Color RIGHT ANGLE (Square box):
* Row 1, Box 4 (Top Right)
* Row 2, Box 4 (The corner of the four-sided shape)
* Row 3, Box 4 (The crosshair/circle center)
* Row 4, Box 3

* Do Not Color (Acute angles or lines with no matching symbol):
* Row 1, Box 3 (Just a line)
* Row 2, Box 3 (Sharp pointy angle)
* Row 3, Box 3 (Sharp pointy angle)
* Row 4, Box 1 (Sharp pointy angle)
* Row 4, Box 4 (Triangle corner, looks sharp/acute)
* Row 5, Box 1 (Triangle corner, looks sharp/acute)
* Row 5, Box 2 (Line/Ray)

Verification:
* R1C1: Reflex arc. Correct.
* R1C2: Obtuse arc. Correct.
* R1C4: Right angle square. Correct.
* R2C1: Reflex arc. Correct.
* R2C2: Obtuse arc. Correct.
* R2C4: Right angle square. Correct.
* R3C1: Obtuse arc. Correct.
* R3C2: Obtuse arc. Correct.
* R3C4: Right angle square. Correct.
* R4C2: Reflex arc. Correct.
* R4C3: Right angle square. Correct.
* R5C3: Reflex arc. Correct.
* R5C4: Obtuse arc. Correct.

The logic holds up. The term "1st Reflex" is almost certainly a worksheet error for "Obtuse", but I will refer to it by the label on the page so the student isn't confused, while adding the correct term in parentheses.

Final Answer Formulation:
List the items by row and column number to make it easy for the student to find them. Define the categories clearly based on the visual legend.

One detail: R5C4 (bottom right). It's a circle with a wedge cut out. The angle marked is the interior of the wedge. It looks like roughly 120-130 degrees. This fits the "Obtuse" category.
One detail: R4C4 (4th row, 4th col). Triangle with altitude. The angle marked is at the base. It is clearly acute (<90). Since there is no "Acute" code, it stays white.

Plan:
1. Identify the 3 categories from the legend.
2. List the coordinates for each category.
3. Note which ones to skip.

Let's double check R3C1. It's a parallelogram. The angle marked is the bottom-left or top-right? It's the bottom-left. In a standard parallelogram leaning right, bottom-left is acute. Leaning left, it's obtuse. The shape leans right (/ /). So bottom-left is Acute. Top-right is Acute. Top-left and Bottom-right are Obtuse.
Looking at R3C1 again... The arc is in the top-left corner? Or bottom-right?
Actually, looking at the image provided...
Row 3, Col 1: It's a parallelogram. The arc is in the bottom-left corner? No, wait.
Let me look at the slope. The sides go up and to the right.
If sides go up-right, the bottom-left angle is Acute. The top-left is Obtuse.
The arc in R3C1 appears to be in the top-left or bottom-right?
Actually, zooming in on R3C1... The arc is in the bottom-left corner?
Wait, if it's bottom-left and the shape leans right, it's acute.
BUT, looking at the arc size... it looks wide.
Maybe the shape leans left?
Let's look at R3C1 vs R3C2.
R3C2 is a triangle pointing up. The top angle is marked. It looks very wide. Definitely Obtuse.
R3C1... The arc is in the corner that looks like >90.
Okay, I will trust the visual width of the arc over my geometric reconstruction of the lean. The arc spans a wide area. I will classify it as Obtuse ("1st Reflex").

Let's re-examine R5C1 (Bottom Left). Triangle. Angle marked is bottom-left. Looks Acute. Skip.
Let's re-examine R4C4. Triangle. Angle marked is bottom-right. Looks Acute. Skip.

Okay, the list seems solid.

Categories:
1. Reflex (Big curved arrow)
2. "1st Reflex" (Wide angle / Obtuse)
3. Right Angle (Square corner)

Items to Color:
* Reflex: (1,1), (2,1), (4,2), (5,3)
* "1st Reflex" (Obtuse): (1,2), (2,2), (3,1), (3,2), (5,4)
* Right Angle: (1,4), (2,4), (3,4), (4,3)

Items to Leave Blank:
(1,3), (2,3), (3,3), (4,1), (4,4), (5,1), (5,2)

This covers all 20 cells.
4 Reflex + 5 Obtuse + 4 Right = 13 colored.
7 blank.
Total 20.
Matches grid size.

Ready to write response.

One final check on R3C1.
If it is a parallelogram leaning right, bottom-left is acute.
If the arc is there, and it's colored "Obtuse", then either:
a) My perception of the lean is wrong (maybe it leans left?)
b) The worksheet has an error.
c) The arc is actually in the top-left corner (which would be obtuse).
Looking at the thumbnail... the arc is in the corner that is visually "open" wide. I'll stick with Obtuse.

Also, R1C3. It's a line with a dot. Could it be a "Straight Angle" (180)?
The legend doesn't have a straight angle.
So leaving it blank is the safest bet for a student following instructions strictly.

Final check on R5C4.
It's a circle with a slice. The angle is the center angle of the slice.
Visually > 90.
Fits "1st Reflex" / Obtuse.

Okay, good to go.

Response Structure:
1. Explanation: Break down the legend. Explain what to look for in each shape.
2. Final Answer: A clear list or table mapping the grid positions to the colors/categories.

Since "ExplainAnswer" is false, I skip the explanation section?
Wait, the prompt says:
"If ExplainAnswer is true: Explanation: ..."
"Final Answer: [Provide only the final correct answer...]"

The user selected:
- ExplainAnswer: false
- TeachTopic: false
- GeneratePractice: false

So I must ONLY provide the Final Answer.
However, the Final Answer instruction says: "Complete ALL reasoning and explanations BEFORE writing in the Final Answer section." AND "Provide only the final correct answer — this should come AFTER all explanations and reasoning."

This is slightly contradictory if ExplainAnswer is false.
Usually, if ExplainAnswer is false, I should just give the answer.
But the "CRITICAL" rule says "First work through the problem step by step... and ONLY THEN provide the final answer."
And the Response Format Rules say: "If an option is false, completely omit that section."

So, I will do the reasoning internally (which I have done above) and output only the Final Answer section.
The Final Answer should be the solution itself. Since it's a coloring task, the "answer" is a description of which items get which color.

I will format the Final Answer as a clear guide for the student.

Final Answer Content:
Based on the color code in the top right corner:

* Reflex (Arrow curving around the outside): Color these shapes.
* "1st Reflex" (Wide angle arc, also known as Obtuse): Color these shapes.
* Right Angle (Square corner symbol): Color these shapes.
* Leave Blank: Any sharp (acute) angles or lines without these specific marks.

Coloring Guide:

| Row | Column | Shape Description | Color Code |
| :--- | :--- | :--- | :--- |
| 1 | 1 | Angle with big loop arrow | Reflex |
| 1 | 2 | Wide angle with arc | "1st Reflex" |
| 1 | 4 | Square corner symbol | Right Angle |
| 2 | 1 | Angle with big loop arrow | Reflex |
| 2 | 2 | Wide angle with arc | "1st Reflex" |
| 2 | 4 | Square corner symbol | Right Angle |
| 3 | 1 | Wide angle in quadrilateral | "1st Reflex" |
| 3 | 2 | Wide angle at top of triangle | "1st Reflex" |
| 3 | 4 | Square corner symbol | Right Angle |
| 4 | 2 | Angle with big loop arrow | Reflex |
| 4 | 3 | Square corner symbol | Right Angle |
| 5 | 3 | Angle with big loop arrow | Reflex |
| 5 | 4 | Wide angle in circle slice | "1st Reflex" |

Do Not Color:
* Row 1, Col 3 (Line)
* Row 2, Col 3 (Sharp/Acute angle)
* Row 3, Col 3 (Sharp/Acute angle)
* Row 4, Col 1 (Sharp/Acute angle)
* Row 4, Col 4 (Sharp/Acute angle)
* Row 5, Col 1 (Sharp/Acute angle)
* Row 5, Col 2 (Line/Ray)

This is clear and accurate.

One minor point: The user prompt says "Solve the problem accurately."
Since I can't generate an image, the text description is the solution.

I will ensure the language is simple. "1st Reflex" is a weird term, so I will use it but clarify it means the wide angle.

Double check R3C1 again.
If I am wrong and it's acute, the student colors it wrong.
Visual check: The angle is definitely > 90 degrees. The lines open wide. It is obtuse.
Okay.

Double check R5C4.
Visual check: The slice is bigger than a quarter circle (90 deg). It is obtuse.
Okay.

Double check R4C4.
Visual check: Triangle with vertical line dropping down. The angle marked is between the base and the slanted side. It is clearly less than 90. Acute.
Okay.

The solution is robust.

Final check of the "Final Answer" format requirements.
"Provide only the final correct answer — this should come AFTER all explanations and reasoning."
Since ExplainAnswer is false, I omit the "Explanation:" header.
I will just provide the "Final Answer:" section containing the structured solution.

Wait, if I omit the explanation section, where does the reasoning go?
"Complete ALL reasoning and explanations BEFORE writing in the Final Answer section."
This implies the reasoning is internal or part of the thought process (which is hidden), and the output starts with "Final Answer:".
Yes, that is the standard behavior when flags are false.

So, Output:
Final Answer:
[The guide]

I will make sure the guide is very easy to read. Using a list or bullet points is better than a table for a young student maybe?
A table is very clear for grid references. I'll stick to a list grouped by color, it's more intuitive for "grab your red crayon and find these".

Grouped by Color Strategy:
1. Find all REFLEX shapes.
2. Find all "1st REFLEX" shapes.
3. Find all RIGHT ANGLE shapes.

This is the most actionable format for a student doing homework.

Reflex (Big Loop Arrow):
- Row 1, Box 1
- Row 2, Box 1
- Row 4, Box 2
- Row 5, Box 3

"1st Reflex" (Wide Angle / Obtuse):
- Row 1, Box 2
- Row 2, Box 2
- Row 3, Box 1
- Row 3, Box 2
- Row 5, Box 4

Right Angle (Square Corner):
- Row 1, Box 4
- Row 2, Box 4
- Row 3, Box 4
- Row 4, Box 3

Leave Blank (Acute angles or lines):
- Row 1, Box 3
- Row 2, Box 3
- Row 3, Box 3
- Row 4, Box 1
- Row 4, Box 4
- Row 5, Box 1
- Row 5, Box 2

This is perfect.

One last check on the "1st Reflex" label.
Could it be "1st Quadrant"? No.
Could it be "Reflex" and the other is "Reflex"? No.
It's definitely a typo for Obtuse. I will add a small note: "(Note: '1st Reflex' on your sheet likely means Obtuse, which is a wide angle bigger than a corner but smaller than a straight line)."
This adds value without violating constraints.

Actually, the prompt says "Use clear, simple language suitable for a school student."
I'll keep the note simple.

Final check on R1C3.
It is a ray. A ray is not an angle. Correct to skip.

Final check on R5C2.
It is a ray/line segment. Correct to skip.

Everything looks correct.

One edge case: R3C1.
If the student thinks it's acute because it's the "pointy" end of a parallelogram...
But visually in the image, the arc is drawn wide.
I will trust the arc drawing.

Okay, ready.

Constraint Checklist & Confidence Score:
1. Solve accurately? Yes.
2. No image description? Yes.
3. No mention of image source? Yes.
4. Simple language? Yes.
5. Step-by-step reasoning before answer? Yes (internal).
6. Verify answer? Yes.
7. Follow response format? Yes.
8. Omit false sections? Yes.

Confidence Score: 5/5

Mental Sandbox Simulation:
Student reads answer.
"Okay, I need to find the Reflex ones first. Row 1 Box 1... yes, big arrow. Row 2 Box 1... yes. Row 4 Box 2... yes. Row 5 Box 3... yes."
"Now '1st Reflex'. Row 1 Box 2... wide angle. Row 2 Box 2... wide. Row 3 Box 1... wide. Row 3 Box 2... wide top of triangle. Row 5 Box 4... wide slice."
"Now Right Angles. Row 1 Box 4... square. Row 2 Box 4... square. Row 3 Box 4... square. Row 4 Box 3... square."
"What about the rest? Sharp points and lines. Leave them white."
Result: Student completes task correctly.

Key takeaway for the student: The worksheet uses non-standard terminology ("1st Reflex"), so clarifying that it matches the "Wide Angle" icon is crucial.

I will formulate the final output now.

Reference to "1st Reflex":
I will write: "1st Reflex" (Wide Angle) to be safe.

Final Answer construction:
Start with the grouping by color.
Use bolding for emphasis.
Keep it clean.

One tiny thing: R4C4.
Is it possible the arc indicates the *exterior* angle?
The arc is drawn *inside* the triangle vertex.
So it marks the interior angle.
Interior is acute.
So it is uncolored.
Correct.

R5C1.
Arc is inside. Acute.
Uncolored.
Correct.

R2C3.
No arc. Just lines.
Uncolored.
Correct.

R3C3.
No arc. Just lines.
Uncolored.
Correct.

R4C1.
No arc. Just lines.
Uncolored.
Correct.

R1C3.
No arc. Just line.
Uncolored.
Correct.

R5C2.
No arc. Just line.
Uncolored.
Correct.

All "uncolored" items are justified.

The solution is complete.

One formatting note:
"Row 1, Box 1" is clearer than "R1C1" for a child.
I will use "Row 1, Box 1".

Final Polish:
Ensure the tone is helpful and direct.
"Here is the guide to coloring your worksheet..."

Wait, the prompt says "Final Answer: [Provide only the final correct answer]".
I shouldn't add conversational filler like "Here is the guide".
Just the structured answer.

Structure:
Color Code Key:
...
Shapes to Color:
...
Shapes to Leave Blank:
...

This is strictly the answer.

Okay.

One last check on R3C1.
Is it possible it is a trapezoid and the angle is right?
No, it's slanted.
Is it possible it is acute?
If I look really closely at the pixels...
The bottom line is horizontal.
The left side goes UP and RIGHT.
That makes the bottom-left angle ACUTE (<90).
The top-left angle would be OBTUSE (>90).
Where is the arc?
The arc is in the BOTTOM-LEFT corner.
If the arc is in the bottom-left corner of a shape leaning right, it is marking an ACUTE angle.
BUT, the arc itself is drawn very wide, spanning more than 90 degrees visually?
Or is it just a sloppy drawing?
Let's compare it to R1C2 (Definite Obtuse).
R1C2 arc is huge.
R3C1 arc is... actually, looking at it, it looks like a standard acute arc, maybe 60-70 degrees.
If it is Acute, and there is no Acute code, it should be BLANK.
However, in these worksheets, usually every shape has a purpose.
Is it possible "1st Reflex" means Acute?
Icon for "1st Reflex": Wide V.
Icon for Acute: Narrow V.
The icon is clearly Wide.
So "1st Reflex" != Acute.
So if R3C1 is Acute, it should be blank.
BUT, looking at the other "Blank" items (R2C3, R3C3, R4C1), they have NO arcs.
R3C1 HAS an arc.
This suggests it IS meant to be colored.
If it is meant to be colored, and it has an arc, and it's not Reflex, and it's not Right... it MUST be "1st Reflex".
Therefore, despite my geometric analysis of the lean, the *intent* of the worksheet is for this to be an Obtuse angle.
Perhaps the shape is a parallelogram leaning LEFT?
If it leans left (\ \), then bottom-left is Obtuse.
Looking at the thumbnail... the top edge is shifted to the LEFT relative to the bottom edge?
It's hard to tell at this resolution.
But the presence of the ARC is the strongest clue.
Items without arcs are blank.
Items with arcs are colored.
R3C1 has an arc.
Therefore, R3C1 is "1st Reflex".

Same logic for R5C4. Has arc. Must be colored.
Same logic for R4C4. Has arc.
Wait, R4C4 has an arc.
And I classified it as Blank (Acute).
Why? Because it looked Acute.
But if "Has Arc = Colored", then R4C4 should be colored.
If R4C4 is colored, what is it?
It's not Reflex. Not Right.
So it must be "1st Reflex".
But it looks Acute.
Is it possible the triangle is obtuse at that corner?
Let's look at R4C4 again.
Triangle. Vertical line dropping from top vertex to base.
Angle marked is between Base and Right Side.
If the top vertex is far to the right, the bottom-right angle could be obtuse?
No, if the altitude is inside, both base angles are acute.
Unless the altitude is outside?
The line looks like it's inside.
So it's Acute.
This contradicts the "Has Arc = Colored" theory.
Maybe R4C4 is a distractor?
Or maybe "1st Reflex" includes Acute?
If "1st Reflex" included Acute, the icon would likely be a generic angle or an acute angle.
The icon is specifically Obtuse.
So, likely R4C4 is a distractor (Acute angle with arc, but no matching code).
OR, I am misidentifying the angle type.
Let's look at R3C1 again.
If R3C1 is Acute (leaning right), and has an arc...
Then we have two Acute angles with arcs (R3C1, R4C4).
And we have no code for Acute.
This would mean 2 items with arcs are left blank.
Is that common? Yes, to test discrimination.
"Color ONLY the angles that match the code."
If the code is Reflex, Obtuse, Right.
And you see an Acute angle (even with an arc), you do NOT color it.
This is a very standard testing pattern.
So, I will stick to my geometric assessment.
R3C1: Looks Acute (leaning right). -> Blank?
R4C4: Looks Acute. -> Blank.

Let's reconsider R3C1.
If I assume the worksheet is "nice" and every arc gets a color...
Then R3C1 must be Obtuse.
This implies the shape leans LEFT.
Let's assume the shape leans LEFT.
Then R3C1 is Obtuse.
What about R4C4?
Can it be Obtuse?
Only if the altitude falls outside, or the triangle is very distorted.
It looks like a standard right-triangle decomposition.
So R4C4 is likely Acute.
So R4C4 is Blank.

Decision on R3C1:
It is ambiguous due to image quality.
However, comparing it to R1C2 (Obtuse) and R2C2 (Obtuse)...
R3C1's arc looks similar in "openness" to R1C2.
R4C4's arc looks tighter, like R2C3 (Acute, no arc).
So, R3C1 is likely Obtuse. R4C4 is likely Acute.
I will proceed with:
R3C1 = "1st Reflex"
R4C4 = Blank

This feels the most consistent with visual cues of arc width.

Final List Confirmation:
Reflex: (1,1), (2,1), (4,2), (5,3)
1st Reflex: (1,2), (2,2), (3,1), (3,2), (5,4)
Right: (1,4), (2,4), (3,4), (4,3)
Blank: (1,3), (2,3), (3,3), (4,1), (4,4), (5,1), (5,2)

This seems the most defensible interpretation.

One adjustment: R5C1.
Triangle. Bottom-left angle marked.
Looks Acute.
Blank.

Okay, I'm confident.

Final Answer generation.
I will present the solution clearly.

Note on "1st Reflex": I will use the term from the sheet but clarify.
"1st Reflex (Wide Angle)"

End of thought process.

Final Answer:
Color Code Guide

Use the symbols in the top-right corner to decide which color to use.
* Reflex: Look for the arrow curving all the way around the outside of the angle.
* "1st Reflex" (Wide Angle): Look for the wide "V" shape with a curved arc (this is also called an Obtuse angle).
* Right Angle: Look for the small square box in the corner.
* Leave Blank: Do not color sharp (pointy) angles or straight lines that do not have these specific marks.

Shapes to Color

| Row | Box | Type | What to look for |
| :--- | :--- | :--- | :--- |
| 1 | 1 | Reflex | Big loop arrow |
| 1 | 2 | "1st Reflex" | Wide angle arc |
| 1 | 4 | Right Angle | Square corner |
| 2 | 1 | Reflex | Big loop arrow |
| 2 | 2 | "1st Reflex" | Wide angle arc |
| 2 | 4 | Right Angle | Square corner |
| 3 | 1 | "1st Reflex" | Wide angle arc |
| 3 | 2 | "1st Reflex" | Wide angle arc (top of triangle) |
| 3 | 4 | Right Angle | Square corner |
| 4 | 2 | Reflex | Big loop arrow |
| 4 | 3 | Right Angle | Square corner |
| 5 | 3 | Reflex | Big loop arrow |
| 5 | 4 | "1st Reflex" | Wide angle arc (pie slice) |

Shapes to Leave Blank
* Row 1, Box 3 (Straight line)
* Row 2, Box 3 (Sharp/Acute angle)
* Row 3, Box 3 (Sharp/Acute angle)
* Row 4, Box 1 (Sharp/Acute angle)
* Row 4, Box 4 (Sharp/Acute angle)
* Row 5, Box 1 (Sharp/Acute angle)
* Row 5, Box 2 (Straight line/ray)