Geometry - Angles Worksheet for 4th Grade | Lesson Planet - Free Printable

Explanation:
We are matching angle types with their correct measurements or descriptions.

Let’s go one by one:

1) Right angle
A right angle is exactly 90°.
→ Match with 90°

2) Acute angle
An acute angle is *less than* 90°.
→ Match with < 90°

3) Straight angle
A straight angle looks like a straight line — it’s exactly 180°.
→ Match with 180°

4) Reflex angle
A reflex angle is *more than* 180° but *less than* 360°.
The option given is > 180°, which fits (since reflex angles are >180° and <360°, and the only choice that fits is >180° — note that 360° is a full rotation, not reflex).
→ Match with > 180°

5) Complete rotation
A complete rotation means turning all the way around — that’s 360°.
→ Match with 360°

Wait — we have a conflict: both (3) straight angle and (5) complete rotation seem to want 180° and 360°, but let’s double-check the list of options on the right:

The column on the right has these five choices:
- 360°
- 90°
- >180°
- >90° + 180° ← this looks odd; probably a typo? Let’s read carefully: it says “>90° + 180°” — that doesn’t make sense as a description. More likely, it's meant to be “>90° and <180°”, i.e., obtuse angle — but that’s not listed in the left column. Hmm.

Wait — look again at the left column labels:

1) Right angle
2) Acute angle
3) Straight angle
4) Reflex
5) Complete rotation
6) Obtuse angle ← Wait! The image shows six items on the left, but labeled 1) to 5), and then a 6th labeled “Obtuse angle” — yes, the last one is #6: Obtuse angle, not #5. Let me renumber correctly based on the image structure:

From the image (as described in the prompt), the left side has:
1) Right angle
2) Acute angle
3) Straight angle
4) Reflex
5) Complete rotation
6) Obtuse angle

And the right column has 6 options:
- 360°
- 90°
- >180°
- >90° + 180° ← likely a formatting error; probably meant “>90° and <180°” (i.e., obtuse)
- 180°
- <90°

But the text says:
“>90° + 180°” — that’s suspicious. However, in standard geometry matching:

- Right angle = 90°
- Acute angle = <90°
- Straight angle = 180°
- Reflex angle = >180° and <360° → so >180° fits
- Complete rotation = 360°
- Obtuse angle = >90° and <180° → none of the options say that directly, but one says “>90° + 180°” — that must be a misprint. Given the context, it's almost certainly intended to mean “>90° and <180°”, i.e., obtuse.

So assigning uniquely:

1) Right angle → 90°
2) Acute angle → <90°
3) Straight angle → 180°
4) Reflex → >180°
5) Complete rotation → 360°
6) Obtuse angle → the remaining one: “>90° + 180°” — interpret as >90° (and implicitly <180°)

Yes, that uses all six.

Thus the correct matches are:

1) → 90°
2) → <90°
3) → 180°
4) → >180°
5) → 360°
6) → >90° + 180° (interpreted as obtuse: >90° and <180°)

Since the question asks: “Which characteristics match those angles?”, and the format expects pairing, the final answer should list the matches in order.

But the user likely expects a list like:
1–90°, 2–<90°, 3–180°, 4–>180°, 5–360°, 6–>90°+180°

However, to be precise and safe, let’s verify standard definitions:

- Right angle: exactly 90° ✔
- Acute: less than 90° ✔
- Straight: exactly 180° ✔
- Reflex: greater than 180°, less than 360° → “>180°” is acceptable as the best match among options
- Complete rotation: 360° ✔
- Obtuse: greater than 90°, less than 180° → the only remaining option is “>90° + 180°”, which is poorly written but must mean that.

Given that, the matching is fixed.

Final Answer:
1) 90°
2) <90°
3) 180°
4) >180°
5) 360°
6) >90° + 180°