Math 6 · Unit 13: Angles · Cambridge Primary Maths Stage 6

Questions

1. 1. Two angles of a triangle are 50° and 60°. What is the third?

   • 250°
   • 110°
   • 70°
   • 80°
   Check

2. 2. A right-angled triangle has one angle of 35°. What is the other acute angle?

   • 145°
   • 55°
   • 45°
   • 65°
   Check

3. 3. An isosceles triangle has a top angle of 40°. What is each base angle?

   • 40°
   • 70°
   • 140°
   • 80°
   Check

4. 4. Each angle in an equilateral triangle is …

   • 90°
   • 60°
   • 180°
   • 45°
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5. 5. An isosceles triangle has base angles of 65°. What is the top angle?

   • 65°
   • 130°
   • 115°
   • 50°
   Check

6. 6. Can a triangle have angles 90°, 60° and 40°?

   • Yes
   • No
   Check

7. 7. Can a triangle have an obtuse angle and a right angle?

   • Yes
   • No
   Check

8. 8. A triangle's angles are x, 2x and 3x. What is x?

   • 30°
   • 20°
   • 60°
   • 36°
   Check

9. 9. Two angles of a triangle are equal and the third is 100°. What is each equal angle?

   • 100°
   • 80°
   • 50°
   • 40°
   Check

10. 10. Which set of angles makes a triangle?

    • 45°, 45°, 90°
    • 60°, 60°, 70°
    • 30°, 30°, 30°
    • 100°, 50°, 40°
    Check

11. 11. One angle is 25° and another is 105°. What is the third?

    • 40°
    • 60°
    • 130°
    • 50°
    Check

12. 12. A triangle has angles of 30° and 60°. What type is it?

    • obtuse
    • equilateral
    • isosceles
    • right-angled
    Check

13. 13. A triangle has an angle of 70°. One side next to it is made longer to form a straight line. What is the exterior angle?

    • 70°
    • 290°
    • 110°
    • 20°
    Check

14. 14. A triangle has angles 2a, a and 90°. What is a?

    • 45°
    • 30°
    • 60°
    • 90°
    Check

15. 15. All three angles of a triangle are acute. Could one be 95°?

    • Yes
    • No
    Check