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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 191 · 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.An angle measures 120°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  2. 2.Two angles of a triangle are 45° and 105°. What is the third angle (in degrees)?
  3. 3.Two angles of a triangle are 25° and 25°. What is the third angle (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  5. 5.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  6. 6.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  7. 7.Three angles meet at a point. Two of them are 120° and 110°. What is the third angle (in degrees)?
  8. 8.Two angles of a triangle are 45° and 70°. What is the third angle (in degrees)?
  9. 9.Two angles of a triangle are 65° and 20°. What is the third angle (in degrees)?
  10. 10.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  11. 11.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  12. 12.Two angles together make a straight line. One of them is 80°. What is the other angle (in degrees)?
  13. 13.Three angles meet at a point. Two of them are 70° and 90°. What is the third angle (in degrees)?
  14. 14.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  15. 15.An angle measures 180°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  16. 16.Two angles of a triangle are 45° and 85°. What is the third angle (in degrees)?
  17. 17.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  18. 18.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  19. 19.Two angles of a triangle are 100° and 65°. What is the third angle (in degrees)?
  20. 20.An angle measures 10°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  21. 21.Two angles of a triangle are 50° and 75°. What is the third angle (in degrees)?
  22. 22.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  23. 23.Two angles of a triangle are 70° and 85°. What is the third angle (in degrees)?
  24. 24.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  25. 25.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  26. 26.Two angles of a triangle are 75° and 75°. What is the third angle (in degrees)?
  27. 27.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  28. 28.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  29. 29.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  30. 30.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  31. 31.An angle measures 45°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  32. 32.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  33. 33.Three angles meet at a point. Two of them are 60° and 210°. What is the third angle (in degrees)?
  34. 34.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  35. 35.Two angles of a triangle are 30° and 125°. What is the third angle (in degrees)?
  36. 36.Two angles of a triangle are 30° and 20°. What is the third angle (in degrees)?
  37. 37.Two angles together make a straight line. One of them is 120°. What is the other angle (in degrees)?
  38. 38.Three angles meet at a point. Two of them are 100° and 140°. What is the third angle (in degrees)?
  39. 39.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 140° and 130°. What is the third angle (in degrees)?

Answer key

  1. Obtuse
  2. 30
  3. 130
  4. 40
  5. 90
  6. 25
  7. 130
  8. 65
  9. 95
  10. 75
  11. 150
  12. 100
  13. 200
  14. Right
  15. Straight
  16. 50
  17. 140
  18. 135
  19. 15
  20. Acute
  21. 55
  22. 85
  23. 25
  24. 30
  25. 10
  26. 30
  27. 75
  28. 60
  29. 55
  30. 160
  31. Acute
  32. 30
  33. 90
  34. 150
  35. 25
  36. 130
  37. 60
  38. 120
  39. 80
  40. 90

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