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Measuring Angles with Protractors

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Measuring Angles with Protractors

Help the park-design team check the turns in its new playground. A protractor measures an angle in degrees (°). To measure: place the protractor’s centre on the angle’s point, line up its straight edge with one arm, then read where the other arm points. A right angle is 90°.

Warm-up: turns and corners

Use the clues to think about angles before measuring.

1.The park’s roundabout arrow makes a quarter turn. How many degrees is a quarter turn?
  • 45°
  • 90°
  • 180°
  • 360°
2.A gate swings from closed to fully open through a half turn. How many degrees is that?
3.A square stepping stone has corners like a right angle. What is the size of each right angle?

Measure the playground designs

Measure each angle diagram with a protractor. Name the measurement and decide whether it is smaller than, equal to, or larger than a right angle.

4.Ramp A opens through this angle. What is its measurement, and is it smaller than, equal to, or larger than a right angle?
5.The corner of the sandpit is a square corner. What is the angle measurement?
6.Slide B opens through this angle. What is its measurement, and is it smaller than, equal to, or larger than a right angle?
7.Put the three playground angles in order from smallest to largest: 90°, 120°, and 60°.

Make and explain an angle

Now be the designer. Think about how a protractor helps you make an accurate angle.

8.Draw two arms that make a 90° angle for a new path corner. Label the angle 90°.
9.Chloe says, “A 60° angle is bigger than a 90° angle because 60 is a bigger-looking number.” Is Chloe correct? Explain using the angle sizes.
10.Tell the park team the two important steps for measuring an angle with a protractor.

3 printable pages

  • Measuring Angles with Protractors, page 1 of 3: Warm-up: turns and corners

    Page 1

  • Measuring Angles with Protractors, page 2 of 3: Measure the playground designs

    Page 2

  • Measuring Angles with Protractors, page 3 of 3: Make and explain an angle

    Page 3

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