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Acute angles in a right triangle

Year 8 maths · Fieldbook Learning

Name ______________________ Date __________

A right triangle has one right angle, so the other two angles add to 90 degrees.

  1. A right triangle has one acute angle of 13°. How many degrees is the other acute angle?
  2. A right triangle has one acute angle of 25°. How many degrees is the other acute angle?
  3. A right triangle has one acute angle of 61°. How many degrees is the other acute angle?
  4. A right triangle has one acute angle of 46°. How many degrees is the other acute angle?
  5. A right triangle has one acute angle of 43°. How many degrees is the other acute angle?
  6. A right triangle has one acute angle of 47°. How many degrees is the other acute angle?
  7. A right triangle has one acute angle of 36°. How many degrees is the other acute angle?
  8. A right triangle has one acute angle of 64°. How many degrees is the other acute angle?
  9. A right triangle has one acute angle of 56°. How many degrees is the other acute angle?
  10. A right triangle has one acute angle of 20.5°. How many degrees is the other acute angle?
  11. A right triangle has one acute angle of 7.5°. How many degrees is the other acute angle?
  12. A right triangle has one acute angle of 19.5°. How many degrees is the other acute angle?
  13. A right triangle has one acute angle of 38.5°. How many degrees is the other acute angle?
  14. A right triangle has one acute angle of 50.5°. How many degrees is the other acute angle?
  15. A right triangle has one acute angle of 55°. How many degrees is the other acute angle?
  16. A right triangle has one acute angle of 41°. How many degrees is the other acute angle?
  17. A right triangle has one acute angle of 41.5°. How many degrees is the other acute angle?
  18. A right triangle has one acute angle of 12.5°. How many degrees is the other acute angle?
  19. A right triangle has one acute angle of 59°. How many degrees is the other acute angle?
  20. A right triangle has one acute angle of 16.5°. How many degrees is the other acute angle?
More free practice: fieldbooklearning.com/uk/practice/year-8/acute-angles-in-a-right-triangle/

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Answer key: Acute angles in a right triangle

  1. 77
  2. 65
  3. 29
  4. 44
  5. 47
  6. 43
  7. 54
  8. 26
  9. 34
  10. 69.5
  11. 82.5
  12. 70.5
  13. 51.5
  14. 39.5
  15. 35
  16. 49
  17. 48.5
  18. 77.5
  19. 31
  20. 73.5