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Exterior angle of a triangle

Year 7 maths · Fieldbook Learning

Name ______________________ Date __________

An exterior angle and its interior angle make a straight line. It also equals the sum of the two far interior angles.

  1. Two angles inside a triangle are 54° and 33°. What is the exterior angle at the third vertex, in degrees?
  2. Two angles inside a triangle are 67° and 90°. What is the exterior angle at the third vertex, in degrees?
  3. Two angles inside a triangle are 67° and 49°. What is the exterior angle at the third vertex, in degrees?
  4. Two angles inside a triangle are 37° and 100°. What is the exterior angle at the third vertex, in degrees?
  5. Two angles inside a triangle are 88° and 49°. What is the exterior angle at the third vertex, in degrees?
  6. Two angles inside a triangle are 37° and 117°. What is the exterior angle at the third vertex, in degrees?
  7. Two angles inside a triangle are 58° and 56°. What is the exterior angle at the third vertex, in degrees?
  8. Two angles inside a triangle are 82° and 54°. What is the exterior angle at the third vertex, in degrees?
  9. Two angles inside a triangle are 39° and 88°. What is the exterior angle at the third vertex, in degrees?
  10. Two angles inside a triangle are 28° and 14°. What is the exterior angle at the third vertex, in degrees?
  11. Two angles inside a triangle are 92° and 12°. What is the exterior angle at the third vertex, in degrees?
  12. Two angles inside a triangle are 47° and 95°. What is the exterior angle at the third vertex, in degrees?
  13. Two angles inside a triangle are 77° and 79°. What is the exterior angle at the third vertex, in degrees?
  14. Two angles inside a triangle are 17° and 50°. What is the exterior angle at the third vertex, in degrees?
  15. Two angles inside a triangle are 62° and 52°. What is the exterior angle at the third vertex, in degrees?
  16. Two angles inside a triangle are 58° and 22°. What is the exterior angle at the third vertex, in degrees?
  17. Two angles inside a triangle are 85° and 47°. What is the exterior angle at the third vertex, in degrees?
  18. Two angles inside a triangle are 22° and 11°. What is the exterior angle at the third vertex, in degrees?
  19. Two angles inside a triangle are 93° and 17°. What is the exterior angle at the third vertex, in degrees?
  20. Two angles inside a triangle are 46° and 72°. What is the exterior angle at the third vertex, in degrees?
More free practice: fieldbooklearning.com/au/practice/year-7/exterior-angle-of-a-triangle/

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Answer key: Exterior angle of a triangle

  1. 87
  2. 157
  3. 116
  4. 137
  5. 137
  6. 154
  7. 114
  8. 136
  9. 127
  10. 42
  11. 104
  12. 142
  13. 156
  14. 67
  15. 114
  16. 80
  17. 132
  18. 33
  19. 110
  20. 118