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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 838 · 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 45° and 50°. What is the third angle (in degrees)?
  2. 2.An angle measures 25°. What kind of angle is it? (a) Obtuse (b) Straight (c) Acute
  3. 3.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  4. 4.An angle measures 90°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  5. 5.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  6. 6.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  7. 7.Two angles together make a straight line. One of them is 145°. What is the other angle (in degrees)?
  8. 8.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  9. 9.An angle measures 50°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  10. 10.Two angles of a triangle are 55° and 20°. What is the third angle (in degrees)?
  11. 11.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  12. 12.Two angles of a triangle are 60° and 60°. What is the third angle (in degrees)?
  13. 13.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  14. 14.An angle measures 170°. What kind of angle is it? (a) Right (b) Straight (c) Obtuse
  15. 15.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  16. 16.A right angle is split into two angles. One of them is 75°. What is the other angle (in degrees)?
  17. 17.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  18. 18.Two angles together make a straight line. One of them is 80°. What is the other angle (in degrees)?
  19. 19.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  20. 20.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  21. 21.Two angles of a triangle are 35° and 50°. What is the third angle (in degrees)?
  22. 22.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  23. 23.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  24. 24.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  25. 25.Three angles meet at a point. Two of them are 70° and 50°. What is the third angle (in degrees)?
  26. 26.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  27. 27.Two angles together make a straight line. One of them is 60°. What is the other angle (in degrees)?
  28. 28.Three angles meet at a point. Two of them are 80° and 210°. What is the third angle (in degrees)?
  29. 29.Two angles of a triangle are 35° and 40°. What is the third angle (in degrees)?
  30. 30.Two angles of a triangle are 30° and 130°. What is the third angle (in degrees)?
  31. 31.Three angles meet at a point. Two of them are 100° and 160°. What is the third angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  33. 33.Two angles together make a straight line. One of them is 75°. What is the other angle (in degrees)?
  34. 34.Three angles meet at a point. Two of them are 60° and 100°. What is the third angle (in degrees)?
  35. 35.Three angles meet at a point. Two of them are 100° and 180°. What is the third angle (in degrees)?
  36. 36.Three angles meet at a point. Two of them are 110° and 100°. What is the third angle (in degrees)?
  37. 37.An angle measures 80°. What kind of angle is it? (a) Right (b) Straight (c) Acute
  38. 38.Two angles together make a straight line. One of them is 135°. What is the other angle (in degrees)?
  39. 39.Two angles of a triangle are 100° and 25°. What is the third angle (in degrees)?
  40. 40.Two angles of a triangle are 30° and 60°. What is the third angle (in degrees)?

Answer key

  1. 85
  2. Acute
  3. 50
  4. Right
  5. 45
  6. 160
  7. 35
  8. 75
  9. Acute
  10. 105
  11. 110
  12. 60
  13. 130
  14. Obtuse
  15. 50
  16. 15
  17. 20
  18. 100
  19. 150
  20. 135
  21. 95
  22. 150
  23. 155
  24. 10
  25. 240
  26. 60
  27. 120
  28. 70
  29. 105
  30. 20
  31. 100
  32. 25
  33. 105
  34. 200
  35. 80
  36. 150
  37. Acute
  38. 45
  39. 55
  40. 90

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