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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 145 · 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 85° and 20°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 45° and 80°. What is the third angle (in degrees)?
  3. 3.An angle measures 80°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  4. 4.Three angles meet at a point. Two of them are 130° and 90°. What is the third angle (in degrees)?
  5. 5.An angle measures 90°. What kind of angle is it? (a) Right (b) Acute (c) Straight
  6. 6.Two angles together make a straight line. One of them is 120°. What is the other angle (in degrees)?
  7. 7.Two angles of a triangle are 50° and 50°. What is the third angle (in degrees)?
  8. 8.Two angles of a triangle are 70° and 70°. What is the third angle (in degrees)?
  9. 9.An angle measures 180°. What kind of angle is it? (a) Obtuse (b) Right (c) Straight
  10. 10.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  11. 11.Three angles meet at a point. Two of them are 80° and 180°. What is the third angle (in degrees)?
  12. 12.Two angles of a triangle are 95° and 40°. What is the third angle (in degrees)?
  13. 13.Two angles of a triangle are 60° and 105°. What is the third angle (in degrees)?
  14. 14.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  15. 15.Two angles of a triangle are 75° and 35°. What is the third angle (in degrees)?
  16. 16.Two angles of a triangle are 35° and 130°. What is the third angle (in degrees)?
  17. 17.Three angles meet at a point. Two of them are 70° and 160°. What is the third angle (in degrees)?
  18. 18.Two angles of a triangle are 80° and 60°. What is the third angle (in degrees)?
  19. 19.Two angles of a triangle are 80° and 45°. What is the third angle (in degrees)?
  20. 20.Two angles of a triangle are 65° and 25°. What is the third angle (in degrees)?
  21. 21.Two angles of a triangle are 30° and 25°. What is the third angle (in degrees)?
  22. 22.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  23. 23.Two angles of a triangle are 20° and 70°. What is the third angle (in degrees)?
  24. 24.Two angles of a triangle are 85° and 75°. What is the third angle (in degrees)?
  25. 25.Three angles meet at a point. Two of them are 150° and 100°. What is the third angle (in degrees)?
  26. 26.Two angles of a triangle are 40° and 125°. What is the third angle (in degrees)?
  27. 27.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  28. 28.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  29. 29.What is the smaller angle between the hands of a clock at 8 o'clock (in degrees)?
  30. 30.Three angles meet at a point. Two of them are 60° and 80°. What is the third angle (in degrees)?
  31. 31.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  33. 33.An angle measures 175°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  34. 34.An angle measures 20°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  35. 35.An angle measures 50°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  36. 36.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  37. 37.Two angles of a triangle are 70° and 55°. What is the third angle (in degrees)?
  38. 38.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  39. 39.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 110° and 60°. What is the third angle (in degrees)?

Answer key

  1. 75
  2. 55
  3. Acute
  4. 140
  5. Right
  6. 60
  7. 80
  8. 40
  9. Straight
  10. 90
  11. 100
  12. 45
  13. 15
  14. 30
  15. 70
  16. 15
  17. 130
  18. 40
  19. 55
  20. 90
  21. 125
  22. 30
  23. 90
  24. 20
  25. 110
  26. 15
  27. 65
  28. 135
  29. 120
  30. 220
  31. 60
  32. 75
  33. Obtuse
  34. Acute
  35. Acute
  36. 5
  37. 55
  38. 60
  39. 55
  40. 190

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