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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 507 · 40 sums
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The method (Know the totals): Acute < 90°, right = 90°, obtuse between 90° and 180°, straight = 180°. On a straight line: the two angles add up to 180°. In a triangle: the three angles add up to 180°. Around a point: 360°. Clock: each hour mark is 30° apart (360° ÷ 12).

NameDateTime takenScore ___ / 40
  1. 1.Two angles of a triangle are 75° and 70°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 40° and 20°. What is the third angle (in degrees)?
  3. 3.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  4. 4.Two angles of a triangle are 85° and 50°. What is the third angle (in degrees)?
  5. 5.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  6. 6.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  7. 7.Three angles meet at a point. Two of them are 110° and 190°. What is the third angle (in degrees)?
  8. 8.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  9. 9.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  10. 10.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  11. 11.Three angles meet at a point. Two of them are 70° and 140°. What is the third angle (in degrees)?
  12. 12.Three angles meet at a point. Two of them are 130° and 110°. What is the third angle (in degrees)?
  13. 13.Three angles meet at a point. Two of them are 100° and 50°. What is the third angle (in degrees)?
  14. 14.Two angles of a triangle are 75° and 20°. What is the third angle (in degrees)?
  15. 15.Three angles meet at a point. Two of them are 90° and 90°. What is the third angle (in degrees)?
  16. 16.An angle measures 125°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  17. 17.An angle measures 175°. What kind of angle is it? (a) Obtuse (b) Straight (c) Acute
  18. 18.Three angles meet at a point. Two of them are 140° and 150°. What is the third angle (in degrees)?
  19. 19.Two angles of a triangle are 95° and 50°. What is the third angle (in degrees)?
  20. 20.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 85°. What is the other angle (in degrees)?
  22. 22.Two angles of a triangle are 35° and 135°. What is the third angle (in degrees)?
  23. 23.A right angle is split into two angles. One of them is 75°. What is the other angle (in degrees)?
  24. 24.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  25. 25.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  26. 26.An angle measures 165°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  27. 27.An angle measures 10°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  28. 28.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  29. 29.Three angles meet at a point. Two of them are 100° and 190°. What is the third angle (in degrees)?
  30. 30.Three angles meet at a point. Two of them are 150° and 80°. What is the third angle (in degrees)?
  31. 31.Two angles of a triangle are 60° and 45°. What is the third angle (in degrees)?
  32. 32.Three angles meet at a point. Two of them are 60° and 90°. What is the third angle (in degrees)?
  33. 33.An angle measures 180°. What kind of angle is it? (a) Acute (b) Right (c) Straight
  34. 34.An angle measures 65°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  35. 35.Three angles meet at a point. Two of them are 150° and 150°. What is the third angle (in degrees)?
  36. 36.Three angles meet at a point. Two of them are 130° and 50°. What is the third angle (in degrees)?
  37. 37.Two angles of a triangle are 30° and 100°. What is the third angle (in degrees)?
  38. 38.Three angles meet at a point. Two of them are 50° and 80°. What is the third angle (in degrees)?
  39. 39.An angle measures 145°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  40. 40.Two angles of a triangle are 25° and 80°. What is the third angle (in degrees)?

Answer key

  1. 35
  2. 120
  3. 20
  4. 45
  5. 90
  6. Right
  7. 60
  8. 30
  9. 120
  10. 35
  11. 150
  12. 120
  13. 210
  14. 85
  15. 180
  16. Obtuse
  17. Obtuse
  18. 70
  19. 35
  20. 20
  21. 95
  22. 10
  23. 15
  24. 50
  25. 80
  26. Obtuse
  27. Acute
  28. 50
  29. 70
  30. 130
  31. 75
  32. 210
  33. Straight
  34. Acute
  35. 60
  36. 180
  37. 50
  38. 230
  39. Obtuse
  40. 75

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