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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 545 · 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 175°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  2. 2.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 85°. What is the other angle (in degrees)?
  4. 4.Three angles meet at a point. Two of them are 70° and 120°. What is the third angle (in degrees)?
  5. 5.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  6. 6.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  7. 7.Two angles of a triangle are 25° and 125°. What is the third angle (in degrees)?
  8. 8.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  9. 9.Two angles together make a straight line. One of them is 145°. What is the other angle (in degrees)?
  10. 10.Three angles meet at a point. Two of them are 60° and 220°. What is the third angle (in degrees)?
  11. 11.An angle measures 180°. What kind of angle is it? (a) Acute (b) Right (c) Straight
  12. 12.An angle measures 10°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  13. 13.An angle measures 85°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  14. 14.An angle measures 90°. What kind of angle is it? (a) Right (b) Straight (c) Obtuse
  15. 15.Three angles meet at a point. Two of them are 140° and 100°. What is the third angle (in degrees)?
  16. 16.Two angles of a triangle are 95° and 60°. What is the third angle (in degrees)?
  17. 17.Three angles meet at a point. Two of them are 100° and 170°. What is the third angle (in degrees)?
  18. 18.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  19. 19.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  20. 20.Three angles meet at a point. Two of them are 90° and 140°. What is the third angle (in degrees)?
  21. 21.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  22. 22.What is the smaller angle between the hands of a clock at 8 o'clock (in degrees)?
  23. 23.Two angles of a triangle are 90° and 50°. What is the third angle (in degrees)?
  24. 24.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  25. 25.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  26. 26.Two angles of a triangle are 45° and 80°. What is the third angle (in degrees)?
  27. 27.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  28. 28.Three angles meet at a point. Two of them are 50° and 50°. What is the third angle (in degrees)?
  29. 29.Two angles of a triangle are 80° and 25°. What is the third angle (in degrees)?
  30. 30.Two angles of a triangle are 65° and 45°. What is the third angle (in degrees)?
  31. 31.Three angles meet at a point. Two of them are 110° and 170°. What is the third angle (in degrees)?
  32. 32.Two angles of a triangle are 45° and 25°. What is the third angle (in degrees)?
  33. 33.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  34. 34.Two angles of a triangle are 50° and 45°. What is the third angle (in degrees)?
  35. 35.Two angles of a triangle are 20° and 85°. What is the third angle (in degrees)?
  36. 36.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  37. 37.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  38. 38.Two angles of a triangle are 75° and 85°. What is the third angle (in degrees)?
  39. 39.An angle measures 160°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  40. 40.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?

Answer key

  1. Obtuse
  2. 140
  3. 95
  4. 170
  5. 55
  6. 170
  7. 30
  8. 135
  9. 35
  10. 80
  11. Straight
  12. Acute
  13. Acute
  14. Right
  15. 120
  16. 25
  17. 90
  18. 35
  19. 180
  20. 130
  21. 150
  22. 120
  23. 40
  24. 80
  25. 90
  26. 55
  27. 20
  28. 260
  29. 75
  30. 70
  31. 80
  32. 110
  33. 80
  34. 85
  35. 75
  36. 50
  37. 10
  38. 20
  39. Obtuse
  40. 165

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