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Math 8 · Unit 5: Angles and constructions · Cambridge Lower Secondary Maths Stage 8

5.2 The exterior angle of a triangle

15 questions · e.g. Interior angles are 50° and 60°. What is the exterior …

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Questions

  1. 1. Two interior angles of a triangle are 50° and 60°. What is the exterior angle x at the third vertex?

    50°60°x
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  2. 2. The exterior angle of a triangle is 130°, and one of the opposite interior angles is 70°. What is the other opposite interior angle, y?

    70°y130°
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  3. 3. An interior angle is 45°. What is the exterior angle next to it?

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  4. 4. Exterior angle = sum of …

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  5. 5. Equilateral triangle: what is each exterior angle?

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  6. 6. The two interior angles opposite an exterior angle are 35° and 90°. What is the exterior angle x?

    35°90°x
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  7. 7. Exterior angle 150°, opposite interior angles x and 2x. Find x.

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  8. 8. Exterior angles of a triangle (one at each vertex) add up to …

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  9. 9. Isosceles triangle, top angle 40°. Exterior angle at a base vertex?

    40°?
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  10. 10. An exterior angle of 90° means the interior angle next to it is …

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  11. 11. Can an exterior angle be smaller than one of its opposite interior angles?

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  12. 12. Interior angles 25°, 65°, 90°. Exterior angle at the 90° vertex?

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  13. 13. Interior angles 25°, 65°, 90°. Exterior angle at the 25° vertex?

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  14. 14. Exterior angle 4y, opposite angles y + 20 and 2y + 10. Find y.

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  15. 15. An exterior angle is 100°. What is the interior angle next to it?

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