Measuring and comparing angles
Name: _____________________ Date: __________
Show your thinking with numbers, words, or a drawing.
1. An acute angle has arms 5 cm long. On the protractor, its open arm points to the 54° mark, measured up from 0°. What is the size of the angle in degrees?
2. An acute angle has arms 6 cm long. On the protractor, its open arm points to the 63° mark, measured up from 0°. What is the size of the angle in degrees?
3. An acute angle has arms 5 cm long. On the protractor, its open arm points to the 68° mark, measured up from 0°. What is the size of the angle in degrees?
4. An acute angle has arms 8 cm long. On the protractor, its open arm points to the 42° mark, measured up from 0°. What is the size of the angle in degrees?
5. An acute angle has arms 4 cm long. On the protractor, its open arm points to the 23° mark, measured up from 0°. What is the size of the angle in degrees?
Answer key · Measuring and comparing angles
1. 54
Read the scale that starts at 0° on the same arm.
The angle is acute, so it is less than 90°.
The open arm reaches 54, so the angle is 54°.
2. 63
Read the scale that starts at 0° on the same arm.
The angle is acute, so it is less than 90°.
The open arm reaches 63, so the angle is 63°.
3. 68
Read the scale that starts at 0° on the same arm.
The angle is acute, so it is less than 90°.
The open arm reaches 68, so the angle is 68°.
4. 42
Read the scale that starts at 0° on the same arm.
The angle is acute, so it is less than 90°.
The open arm reaches 42, so the angle is 42°.
5. 23
Read the scale that starts at 0° on the same arm.
The angle is acute, so it is less than 90°.
The open arm reaches 23, so the angle is 23°.
Try it together
Choose a question from the printable. Use objects or a drawing to show your thinking, then explain your method to someone at home.