Printable Measuring Angle Worksheets - Free Printable

Explanation:
We are given four angles to measure and classify. The four types of angles are:

- Acute angle: less than 90°
- Right angle: exactly 90°
- Obtuse angle: more than 90° but less than 180°
- Straight angle: exactly 180°

Let’s go one by one, using the protractor shown (standard half-circle protractor, 0° to 180°):

1. Top-left angle:
- One side lies along the 0° line (rightward).
- The other side points upward-left, landing at about 30° (since it's a small angle, clearly less than 45°).
- So this is an acute angle.

2. Top-right angle:
- One side horizontal (0°), the other vertical upward — that’s a perfect corner.
- This is exactly 90°, so it’s a right angle.

3. Bottom-left angle:
- One side along 0°, the other goes up-right, pointing near 135° (since it’s halfway between 90° and 180°, which is 135°).
- That’s greater than 90° but less than 180° → obtuse angle.

4. Bottom-right angle:
- The two sides form a straight line (one to the left, one to the right), passing through the center.
- This is exactly 180° → straight angle.

Double-checking:
- 30° → acute ✔
- 90° → right ✔
- 135° → obtuse ✔
- 180° → straight ✔

All match standard angle classifications.

Final Answer:
Acute, Right, Obtuse, Straight