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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 367 · 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 145°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  2. 2.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 125°. What is the other angle (in degrees)?
  4. 4.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  5. 5.An angle measures 90°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  6. 6.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  7. 7.Two angles of a triangle are 45° and 80°. What is the third angle (in degrees)?
  8. 8.Two angles together make a straight line. One of them is 135°. What is the other angle (in degrees)?
  9. 9.Three angles meet at a point. Two of them are 70° and 60°. What is the third angle (in degrees)?
  10. 10.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  11. 11.Three angles meet at a point. Two of them are 130° and 100°. What is the third angle (in degrees)?
  12. 12.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  13. 13.An angle measures 85°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  14. 14.Three angles meet at a point. Two of them are 80° and 130°. What is the third angle (in degrees)?
  15. 15.Two angles of a triangle are 55° and 115°. What is the third angle (in degrees)?
  16. 16.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  17. 17.Two angles of a triangle are 70° and 90°. What is the third angle (in degrees)?
  18. 18.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  19. 19.Two angles of a triangle are 20° and 150°. What is the third angle (in degrees)?
  20. 20.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?
  21. 21.An angle measures 180°. What kind of angle is it? (a) Obtuse (b) Right (c) Straight
  22. 22.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  23. 23.An angle measures 65°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  24. 24.Two angles of a triangle are 75° and 25°. What is the third angle (in degrees)?
  25. 25.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  26. 26.Three angles meet at a point. Two of them are 90° and 170°. What is the third angle (in degrees)?
  27. 27.An angle measures 125°. What kind of angle is it? (a) Straight (b) Obtuse (c) Right
  28. 28.Two angles of a triangle are 50° and 120°. What is the third angle (in degrees)?
  29. 29.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  30. 30.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  31. 31.Two angles of a triangle are 90° and 45°. What is the third angle (in degrees)?
  32. 32.Three angles meet at a point. Two of them are 150° and 110°. What is the third angle (in degrees)?
  33. 33.Two angles of a triangle are 100° and 70°. What is the third angle (in degrees)?
  34. 34.Three angles meet at a point. Two of them are 120° and 130°. What is the third angle (in degrees)?
  35. 35.An angle measures 130°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  36. 36.An angle measures 170°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  37. 37.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  38. 38.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  39. 39.Two angles of a triangle are 85° and 25°. What is the third angle (in degrees)?
  40. 40.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?

Answer key

  1. Obtuse
  2. 170
  3. 55
  4. 5
  5. Right
  6. 85
  7. 55
  8. 45
  9. 230
  10. 90
  11. 130
  12. 155
  13. Acute
  14. 150
  15. 10
  16. 55
  17. 20
  18. 30
  19. 10
  20. 165
  21. Straight
  22. 20
  23. Acute
  24. 80
  25. 180
  26. 100
  27. Obtuse
  28. 10
  29. 90
  30. 60
  31. 45
  32. 100
  33. 10
  34. 110
  35. Obtuse
  36. Obtuse
  37. 40
  38. 35
  39. 70
  40. 145

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