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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 445 · 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 70° and 35°. What is the third angle (in degrees)?
  2. 2.An angle measures 155°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  3. 3.An angle measures 135°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  4. 4.An angle measures 90°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  5. 5.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  6. 6.Two angles of a triangle are 90° and 50°. What is the third angle (in degrees)?
  7. 7.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  8. 8.Two angles together make a straight line. One of them is 80°. What is the other angle (in degrees)?
  9. 9.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  10. 10.Two angles of a triangle are 20° and 125°. What is the third angle (in degrees)?
  11. 11.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  12. 12.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  13. 13.An angle measures 110°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  14. 14.Two angles of a triangle are 95° and 40°. What is the third angle (in degrees)?
  15. 15.Three angles meet at a point. Two of them are 80° and 60°. What is the third angle (in degrees)?
  16. 16.Two angles of a triangle are 55° and 20°. What is the third angle (in degrees)?
  17. 17.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  18. 18.An angle measures 175°. What kind of angle is it? (a) Right (b) Obtuse (c) Straight
  19. 19.A right angle is split into two angles. One of them is 50°. What is the other angle (in degrees)?
  20. 20.Two angles of a triangle are 30° and 145°. What is the third angle (in degrees)?
  21. 21.An angle measures 15°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  22. 22.Two angles of a triangle are 60° and 75°. What is the third angle (in degrees)?
  23. 23.Three angles meet at a point. Two of them are 50° and 160°. What is the third angle (in degrees)?
  24. 24.Three angles meet at a point. Two of them are 140° and 60°. What is the third angle (in degrees)?
  25. 25.Three angles meet at a point. Two of them are 60° and 190°. What is the third angle (in degrees)?
  26. 26.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  27. 27.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  28. 28.Two angles of a triangle are 25° and 130°. What is the third angle (in degrees)?
  29. 29.Two angles of a triangle are 80° and 85°. What is the third angle (in degrees)?
  30. 30.Two angles of a triangle are 55° and 85°. What is the third angle (in degrees)?
  31. 31.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  32. 32.Three angles meet at a point. Two of them are 150° and 90°. What is the third angle (in degrees)?
  33. 33.Two angles together make a straight line. One of them is 110°. What is the other angle (in degrees)?
  34. 34.Three angles meet at a point. Two of them are 60° and 210°. What is the third angle (in degrees)?
  35. 35.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  36. 36.Two angles of a triangle are 25° and 90°. What is the third angle (in degrees)?
  37. 37.Three angles meet at a point. Two of them are 150° and 70°. What is the third angle (in degrees)?
  38. 38.Two angles of a triangle are 60° and 55°. What is the third angle (in degrees)?
  39. 39.Three angles meet at a point. Two of them are 130° and 90°. What is the third angle (in degrees)?
  40. 40.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?

Answer key

  1. 75
  2. Obtuse
  3. Obtuse
  4. Right
  5. 35
  6. 40
  7. 140
  8. 100
  9. 5
  10. 35
  11. 50
  12. 60
  13. Obtuse
  14. 45
  15. 220
  16. 105
  17. 70
  18. Obtuse
  19. 40
  20. 5
  21. Acute
  22. 45
  23. 150
  24. 160
  25. 110
  26. 25
  27. 45
  28. 25
  29. 15
  30. 40
  31. 150
  32. 120
  33. 70
  34. 90
  35. 130
  36. 65
  37. 140
  38. 65
  39. 140
  40. 155

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