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Angle Measure Mastery

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Angle Measure Mastery worksheet preview

Angle Measure Mastery

Protractor and angles illustration

📐 Part 1: Angle Knowledge

1. Which angle type measures exactly 90°?

Acute angle

Right angle

Obtuse angle

2. An angle measuring 45° is classified as:

Acute (less than 90°)

Right (exactly 90°)

Obtuse (greater than 90°)

3. Check all the angle measures that would be obtuse angles:

120°

75°

135°

90°

4. When using a protractor, where should you place the centre point?

On one of the angle rays

On the vertex (corner) of the angle

Anywhere on the protractor

📏 Part 2: Measuring and Drawing

5. Use your protractor to measure the angles below. Write the degree measure and classify each angle.

Angle A: ______° This angle is _________________ because _________________________________

Angle B: ______° This angle is _________________ because _________________________________

Angle C: ______° This angle is _________________ because _________________________________

6. Draw and label the following angles using your protractor:

a) Draw a 60° angle and label it as acute, right, or obtuse:

b) Draw a 110° angle and label it as acute, right, or obtuse:

🔍 Part 3: Real-Life Applications

7. Look at the angles in these everyday situations. Estimate first, then explain your reasoning.

A door that is slightly open: I estimate this angle is approximately ______° and it is _________________ because:

The corner of a rectangular book: I estimate this angle is approximately ______° and it is _________________ because:

8. Explain the steps you follow when measuring an angle with a protractor:
9. Extension Challenge: If one angle in a triangle measures 90° and another measures 35°, what type of angle is the third angle? Show your working.

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