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Base angles of an isosceles triangle

Grade 7 math · Fieldbook Learning

Name ______________________ Date __________

In an isosceles triangle the two base angles are equal. All three angles add to 180 degrees.

  1. An isosceles triangle has an apex angle of 40°. How many degrees is each base angle?
  2. An isosceles triangle has an apex angle of 46°. How many degrees is each base angle?
  3. An isosceles triangle has an apex angle of 36°. How many degrees is each base angle?
  4. An isosceles triangle has an apex angle of 30°. How many degrees is each base angle?
  5. An isosceles triangle has an apex angle of 74°. How many degrees is each base angle?
  6. An isosceles triangle has an apex angle of 146°. How many degrees is each base angle?
  7. An isosceles triangle has an apex angle of 44°. How many degrees is each base angle?
  8. An isosceles triangle has an apex angle of 144°. How many degrees is each base angle?
  9. An isosceles triangle has an apex angle of 90°. How many degrees is each base angle?
  10. An isosceles triangle has an apex angle of 72°. How many degrees is each base angle?
  11. An isosceles triangle has an apex angle of 160°. How many degrees is each base angle?
  12. An isosceles triangle has an apex angle of 50°. How many degrees is each base angle?
  13. An isosceles triangle has an apex angle of 98°. How many degrees is each base angle?
  14. An isosceles triangle has an apex angle of 80°. How many degrees is each base angle?
  15. An isosceles triangle has an apex angle of 24°. How many degrees is each base angle?
  16. An isosceles triangle has an apex angle of 134°. How many degrees is each base angle?
  17. An isosceles triangle has an apex angle of 164°. How many degrees is each base angle?
  18. An isosceles triangle has an apex angle of 38°. How many degrees is each base angle?
  19. An isosceles triangle has an apex angle of 114°. How many degrees is each base angle?
  20. An isosceles triangle has an apex angle of 48°. How many degrees is each base angle?
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Answer key: Base angles of an isosceles triangle

  1. 70
  2. 67
  3. 72
  4. 75
  5. 53
  6. 17
  7. 68
  8. 18
  9. 45
  10. 54
  11. 10
  12. 65
  13. 41
  14. 50
  15. 78
  16. 23
  17. 8
  18. 71
  19. 33
  20. 66