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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 981 · 40 sums
TalentJR

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 20° and 145°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 25° and 70°. What is the third angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?
  4. 4.Two angles of a triangle are 25° and 145°. What is the third angle (in degrees)?
  5. 5.An angle measures 110°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  6. 6.An angle measures 90°. What kind of angle is it? (a) Right (b) Acute (c) Straight
  7. 7.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  8. 8.Two angles together make a straight line. One of them is 75°. What is the other angle (in degrees)?
  9. 9.Three angles meet at a point. Two of them are 120° and 140°. What is the third angle (in degrees)?
  10. 10.Three angles meet at a point. Two of them are 140° and 70°. What is the third angle (in degrees)?
  11. 11.Two angles of a triangle are 100° and 35°. What is the third angle (in degrees)?
  12. 12.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  13. 13.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  14. 14.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  15. 15.An angle measures 175°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  16. 16.Two angles of a triangle are 20° and 115°. What is the third angle (in degrees)?
  17. 17.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  18. 18.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  19. 19.An angle measures 65°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  20. 20.Three angles meet at a point. Two of them are 60° and 140°. What is the third angle (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  22. 22.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  23. 23.Three angles meet at a point. Two of them are 120° and 70°. What is the third angle (in degrees)?
  24. 24.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  25. 25.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  26. 26.An angle measures 20°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  27. 27.Three angles meet at a point. Two of them are 80° and 120°. What is the third angle (in degrees)?
  28. 28.An angle measures 180°. What kind of angle is it? (a) Obtuse (b) Straight (c) Right
  29. 29.Three angles meet at a point. Two of them are 140° and 80°. What is the third angle (in degrees)?
  30. 30.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  31. 31.Three angles meet at a point. Two of them are 130° and 50°. What is the third angle (in degrees)?
  32. 32.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  33. 33.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  34. 34.Two angles of a triangle are 65° and 105°. What is the third angle (in degrees)?
  35. 35.Three angles meet at a point. Two of them are 70° and 70°. What is the third angle (in degrees)?
  36. 36.An angle measures 80°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  37. 37.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  38. 38.Three angles meet at a point. Two of them are 50° and 220°. What is the third angle (in degrees)?
  39. 39.Two angles of a triangle are 60° and 30°. What is the third angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 120° and 110°. What is the third angle (in degrees)?

Answer key

  1. 15
  2. 85
  3. 165
  4. 10
  5. Obtuse
  6. Right
  7. 85
  8. 105
  9. 100
  10. 150
  11. 45
  12. 120
  13. 30
  14. 90
  15. Obtuse
  16. 45
  17. 125
  18. 145
  19. Acute
  20. 160
  21. 30
  22. 135
  23. 170
  24. 30
  25. 40
  26. Acute
  27. 160
  28. Straight
  29. 140
  30. 55
  31. 180
  32. 90
  33. 115
  34. 10
  35. 220
  36. Acute
  37. 160
  38. 90
  39. 90
  40. 130

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