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Describing Angles worksheet for students to estimate, classify, and notate angles.

Worksheet titled "Describing Angles" with a table for estimating angle sizes, identifying types, and writing notations, including an example and several angles labeled with letters.

Worksheet titled "Describing Angles" with a table for estimating angle sizes, identifying types, and writing notations, including an example and several angles labeled with letters.

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Show Answer Key & Explanations Step-by-step solution for: Naming Angles Worksheet | PDF Printable Geometry Worksheet
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Let’s go through each angle one by one. We’ll estimate its size, say what type it is (acute, right, obtuse, reflex), and write the correct notation using the three letters given.

Remember:
- Acute = less than 90°
- Right = exactly 90°
- Obtuse = between 90° and 180°
- Reflex = more than 180°

Notation always uses the vertex (corner point) in the middle — like ∠ABC means B is the corner.

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Angle DEF (D-E-F)
Looks like a small sharp angle — maybe around 50°.
Type: Acute
Notation: ∠DEF or ∠FED → but since E is the vertex, we write ∠DEF (middle letter is vertex).

Wait — looking at the diagram: points are D, E, F with E as the vertex. So yes, ∠DEF.

Estimate: 50°
Type: ACUTE
Notation: ∠DEF

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Angle GHI (G-H-I)
This looks even smaller — maybe 30°?
Vertex is H.
Type: Acute
Notation: ∠GHI

Estimate: 30°
Type: ACUTE
Notation: ∠GHI

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Angle JKL (J-K-L)
This one opens wider — looks like about 120°.
Vertex is K.
Type: Obtuse (between 90° and 180°)
Notation: ∠JKL

Estimate: 120°
Type: OBTUSE
Notation: ∠JKL

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Angle MNO (M-N-O)
There’s a circle drawn around the outside — that means it’s the big angle going the long way around.
The small angle inside looks like 70°, so the reflex angle is 360° - 70° = 290°.
Vertex is N.
Type: REFLEX
Notation: ∠MNO (but note: sometimes they specify direction, but here just use the three points with vertex in middle)

Actually — wait! The arc is drawn on the *outside*, meaning we’re measuring the reflex angle. So yes, 290°.

Estimate: 290°
Type: REFLEX
Notation: ∠MNO

But let me double-check: if the inner angle is ~70°, then outer is 290° — correct.

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Angle PQR (P-Q-R)
Very narrow — looks like 25°.
Vertex is Q.
Type: Acute
Notation: ∠PQR

Estimate: 25°
Type: ACUTE
Notation: ∠PQR

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Angle STU (S-T-U)
Looks like about 70° — still acute.
Vertex is T.
Type: Acute
Notation: ∠STU

Estimate: 70°
Type: ACUTE
Notation: ∠STU

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Angle VWX (V-W-X)
Has a square corner mark — that means it’s exactly 90°.
Vertex is W.
Type: RIGHT
Notation: ∠VWX

Estimate: 90°
Type: RIGHT
Notation: ∠VWX

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Angle YZA (Y-Z-A)
Again, there’s a circle around the outside — reflex angle.
Inner angle looks like 40°, so reflex = 360° - 40° = 320°.
Vertex is Z.
Type: REFLEX
Notation: ∠YZA

Estimate: 320°
Type: REFLEX
Notation: ∠YZA

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Angle TPE (T-P-E)
Looks like about 110° — obtuse.
Vertex is P.
Type: OBTUSE
Notation: ∠TPE

Estimate: 110°
Type: OBTUSE
Notation: ∠TPE

---

Now let’s put all answers into the table format as requested.

Final Answer:

| Angle | Estimate | Type | Notation |
|-------|----------|----------|----------|
| Example: ABC | 35° | ACUTE | ∠ABC |
| DEF | 50° | ACUTE | ∠DEF |
| GHI | 30° | ACUTE | ∠GHI |
| JKL | 120° | OBTUSE | ∠JKL |
| MNO | 290° | REFLEX | ∠MNO |
| PQR | 25° | ACUTE | ∠PQR |
| STU | 70° | ACUTE | ∠STU |
| VWX | 90° | RIGHT | ∠VWX |
| YZA | 320° | REFLEX | ∠YZA |
| TPE | 110° | OBTUSE | ∠TPE |
Parent Tip: Review the logic above to help your child master the concept of angles 4th grade worksheet.
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