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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 488 · 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 together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  2. 2.Two angles of a triangle are 80° and 30°. What is the third angle (in degrees)?
  3. 3.An angle measures 170°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  4. 4.An angle measures 145°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  5. 5.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  6. 6.An angle measures 105°. What kind of angle is it? (a) Right (b) Obtuse (c) Straight
  7. 7.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  8. 8.An angle measures 120°. What kind of angle is it? (a) Obtuse (b) Right (c) Straight
  9. 9.Two angles of a triangle are 25° and 115°. What is the third angle (in degrees)?
  10. 10.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  11. 11.Three angles meet at a point. Two of them are 150° and 80°. What is the third angle (in degrees)?
  12. 12.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  13. 13.Three angles meet at a point. Two of them are 150° and 140°. What is the third angle (in degrees)?
  14. 14.Two angles of a triangle are 55° and 45°. What is the third angle (in degrees)?
  15. 15.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  16. 16.Three angles meet at a point. Two of them are 70° and 110°. What is the third angle (in degrees)?
  17. 17.An angle measures 180°. What kind of angle is it? (a) Acute (b) Right (c) Straight
  18. 18.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  19. 19.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  20. 20.A right angle is split into two angles. One of them is 75°. What is the other angle (in degrees)?
  21. 21.Three angles meet at a point. Two of them are 80° and 110°. What is the third angle (in degrees)?
  22. 22.Three angles meet at a point. Two of them are 130° and 140°. What is the third angle (in degrees)?
  23. 23.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  24. 24.An angle measures 50°. What kind of angle is it? (a) Right (b) Acute (c) Straight
  25. 25.An angle measures 75°. What kind of angle is it? (a) Acute (b) Right (c) Straight
  26. 26.An angle measures 90°. What kind of angle is it? (a) Right (b) Obtuse (c) Straight
  27. 27.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  28. 28.A right angle is split into two angles. One of them is 50°. What is the other angle (in degrees)?
  29. 29.Two angles of a triangle are 95° and 35°. What is the third angle (in degrees)?
  30. 30.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  31. 31.An angle measures 80°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  32. 32.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  33. 33.Two angles of a triangle are 30° and 130°. What is the third angle (in degrees)?
  34. 34.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  35. 35.Three angles meet at a point. Two of them are 100° and 70°. What is the third angle (in degrees)?
  36. 36.Three angles meet at a point. Two of them are 80° and 140°. What is the third angle (in degrees)?
  37. 37.Two angles of a triangle are 40° and 100°. What is the third angle (in degrees)?
  38. 38.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  39. 39.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  40. 40.Two angles of a triangle are 20° and 100°. What is the third angle (in degrees)?

Answer key

  1. 160
  2. 70
  3. Obtuse
  4. Obtuse
  5. 85
  6. Obtuse
  7. 80
  8. Obtuse
  9. 40
  10. 135
  11. 130
  12. 50
  13. 70
  14. 80
  15. 75
  16. 180
  17. Straight
  18. 65
  19. 150
  20. 15
  21. 170
  22. 90
  23. 30
  24. Acute
  25. Acute
  26. Right
  27. 60
  28. 40
  29. 50
  30. 155
  31. Acute
  32. 45
  33. 20
  34. 90
  35. 190
  36. 140
  37. 40
  38. 70
  39. 85
  40. 60

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