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Angle Measurement Practice

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Angle Measurement Practice

Student using protractor to measure angles

📐 Part 1: Real-Life Angle Classification

WALT: Classify angles in everyday situations using correct angle names.

Look at each real-life example and circle the correct angle type.

1. A door that is half open:

Acute (less than 90°)

Right (exactly 90°)

Obtuse (more than 90°)

2. The corner of a rectangular book:

Acute (less than 90°)

Right (exactly 90°)

Obtuse (more than 90°)

3. A traffic sign that has been knocked and is leaning backwards:

Acute (less than 90°)

Right (exactly 90°)

Obtuse (more than 90°)

4. Explain how you know if an angle is acute, right, or obtuse:

📏 Part 2: Measuring Angles with a Protractor

WALT: Measure angles in degrees using a protractor and write the angle size.

Use your protractor to measure each angle. Record the degrees and classify each angle.

5. Angle A: _______ degrees

This angle is: Acute / Right / Obtuse (circle one)

6. Angle B: _______ degrees

This angle is: Acute / Right / Obtuse (circle one)

7. Angle C: _______ degrees

This angle is: Acute / Right / Obtuse (circle one)

8. Before measuring Angle D, estimate its size: _______ degrees

Now measure: Actual size: _______ degrees

How close was your estimate? _________________________________

✏️ Part 3: Drawing and Justifying Angles

WALT: Draw angles of given sizes and explain how we know an angle is acute, right or obtuse.

9. Draw an angle that measures 45°:

This angle is _____________ because it is _____________ than 90°.

10. Draw an angle that measures 90°:

This angle is _____________ because it is _____________ to 90°.

11. Draw an angle that measures 135°:

This angle is _____________ because it is _____________ than 90°.

12. Extension Challenge: Create your own "measurement mystery" - draw an angle that is 25° more than a right angle, then measure to check your accuracy.

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