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Class 5 Maths — Angles and the protractor

Name an angle as acute, right, obtuse or straight, and measure one with a protractor.

Name: ________________________

  1. 1.How many right angles make a full turn?

  2. 2.An angle measures 45°. What kind of angle is it?

    • a) Acute
    • b) Straight
    • c) Right
    • d) Obtuse

  3. 3.Put these angles in order, smallest first.

    • 90°
    • 70°
    • 25°
    • 135°
    • 170°

  4. 4.Match each angle to what it is called.

    • 40°
    • 90°
    • 120°
    • 180°
    • Straight
    • Acute
    • Obtuse
    • Right

  5. 5.An angle is a third of a half turn. How many degrees is it?

  6. 6.Sort each angle by its name.

    Groups: Acute · Obtuse

    • 30°
    • 89°
    • 95°
    • 175°
    • 12°
    • 150°

  7. 7.Two angles sit side by side on a straight line. One of them is 65°. How big is the other, in degrees?

  8. 8.An angle measures 130°. What kind of angle is it?

    • a) Straight
    • b) Obtuse
    • c) Acute
    • d) Right

Answer key — Class 5 Maths — Angles and the protractor

  1. 1. 4
  2. 2. a) Acute
  3. 3. 1. 25° 2. 70° 3. 90° 4. 135° 5. 170°
  4. 4. 40° → Acute; 90° → Right; 120° → Obtuse; 180° → Straight
  5. 5. 60
  6. 6. 30° → Acute; 95° → Obtuse; 89° → Acute; 150° → Obtuse; 12° → Acute; 175° → Obtuse
  7. 7. 115
  8. 8. b) Obtuse