FreeMath
Grade 4medium

Angles Practice

Practice measuring and classifying angles as acute, right, obtuse, or straight. Learn about complementary and supplementary angles.

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All 20 Practice Problems

Every question in this set. Solve them on paper, or use the interactive tool above for instant feedback and hints.

  1. 1.What type of angle is 45 degrees?
  2. 2.What type of angle is 90 degrees?
  3. 3.What type of angle is 120 degrees?
  4. 4.What type of angle is 180 degrees?
  5. 5.What type of angle is 60 degrees?
  6. 6.What type of angle is 135 degrees?
  7. 7.What type of angle is 30 degrees?
  8. 8.What type of angle is 150 degrees?
  9. 9.Two angles are complementary. One is 35 degrees. What is the other?
  10. 10.Two angles are supplementary. One is 70 degrees. What is the other?
  11. 11.Two angles are complementary. One is 48 degrees. What is the other?
  12. 12.Two angles are supplementary. One is 125 degrees. What is the other?
  13. 13.What is the sum of angles in a triangle?
  14. 14.What is the sum of angles in a quadrilateral?
  15. 15.A triangle has angles of 60° and 70°. What is the third angle?
  16. 16.A triangle has angles of 45° and 90°. What is the third angle?
  17. 17.What type of angle is 89 degrees?
  18. 18.What type of angle is 91 degrees?
  19. 19.Two angles are complementary. One is 72 degrees. What is the other?
  20. 20.Two angles are supplementary. One is 95 degrees. What is the other?
Show answer key
  1. 1.What type of angle is 45 degrees? Answer: acute
  2. 2.What type of angle is 90 degrees? Answer: right
  3. 3.What type of angle is 120 degrees? Answer: obtuse
  4. 4.What type of angle is 180 degrees? Answer: straight
  5. 5.What type of angle is 60 degrees? Answer: acute
  6. 6.What type of angle is 135 degrees? Answer: obtuse
  7. 7.What type of angle is 30 degrees? Answer: acute
  8. 8.What type of angle is 150 degrees? Answer: obtuse
  9. 9.Two angles are complementary. One is 35 degrees. What is the other? Answer: 55 degrees
  10. 10.Two angles are supplementary. One is 70 degrees. What is the other? Answer: 110 degrees
  11. 11.Two angles are complementary. One is 48 degrees. What is the other? Answer: 42 degrees
  12. 12.Two angles are supplementary. One is 125 degrees. What is the other? Answer: 55 degrees
  13. 13.What is the sum of angles in a triangle? Answer: 180 degrees
  14. 14.What is the sum of angles in a quadrilateral? Answer: 360 degrees
  15. 15.A triangle has angles of 60° and 70°. What is the third angle? Answer: 50 degrees
  16. 16.A triangle has angles of 45° and 90°. What is the third angle? Answer: 45 degrees
  17. 17.What type of angle is 89 degrees? Answer: acute
  18. 18.What type of angle is 91 degrees? Answer: obtuse
  19. 19.Two angles are complementary. One is 72 degrees. What is the other? Answer: 18 degrees
  20. 20.Two angles are supplementary. One is 95 degrees. What is the other? Answer: 85 degrees

About This Practice

This practice set includes 20 angle problems for fourth graders. Understanding angles is foundational for geometry and spatial reasoning.

Want more practice? See all Grade 4 practice →