Angles exercise for grade 4 - Free Printable

Let's solve the problem step by step.

We are asked to label each angle as acute, obtuse, or right based on its measure.

Definitions:

- Acute angle: An angle that is less than 90°.
- Right angle: An angle that is exactly 90° (often marked with a small square).
- Obtuse angle: An angle that is greater than 90° but less than 180°.

Now let’s go through each angle:

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1. Angle ABC
- The angle is small and less than 90°.
✔ Acute

2. Angle DEF
- There is a square symbol at point E → this means it's exactly 90°.
✔ Right

3. Angle GHI
- The angle is large, greater than 90° but less than 180°.
✔ Obtuse

4. Angle JKL
- This is a small angle, clearly less than 90°.
✔ Acute

5. Angle MNO
- The angle is narrow and less than 90°.
✔ Acute

6. Angle PQR
- There is a square symbol at point Q → this means it's exactly 90°.
✔ Right

7. Angle STU
- The angle is wide, more than 90° but less than 180°.
✔ Obtuse

8. Angle VWX
- This is a small angle, less than 90°.
✔ Acute

9. Angle YZA
- The angle is large and appears to be more than 90° but less than 180°.
✔ Obtuse

10. Angle BCD
- The angle is wide, greater than 90°.
✔ Obtuse

11. Angle EFG
- There is a square symbol at point F → this means it's exactly 90°.
✔ Right

12. Angle HIJ
- The angle is small and less than 90°.
✔ Acute

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Final Answers:

1. Acute
2. Right
3. Obtuse
4. Acute
5. Acute
6. Right
7. Obtuse
8. Acute
9. Obtuse
10. Obtuse
11. Right
12. Acute

✔ All angles labeled correctly based on their appearance and markings.