Acute and obtuse angles

Year 4 · Free printable game: Secret code joke

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NC Y4 · CCSS 4.G.A.1
Name:Date:

Secret code joke

What has keys but can’t open locks?

Answer each question. Find the letter next to the right answer and write it in the box with the same number. The letters spell the punchline!

  1. Is this angle acute, a right angle or obtuse? the point of a slice of cake cut into 6E reflexA acuteX right angleV obtuse
  2. Is this angle acute, a right angle or obtuse? each angle of a regular pentagonU reflexD right angleS acuteP obtuse
  3. Is this angle acute, a right angle or obtuse? each angle of an equilateral triangleB reflexZ obtuseI acuteH right angle
  4. Is this angle acute, a right angle or obtuse? the angle between clock hands at 4 o'clockA obtuseW acuteR right angleD reflex
  5. Is this angle acute, a right angle or obtuse? each angle of a regular octagonN obtuseG right angleB reflexX acute
  6. Is this angle acute, a right angle or obtuse? the angle between clock hands at 10 o'clockS obtuseO acuteM right angleU reflex
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Acute and obtuse angles

Year 4 · Worksheet

learnwith.games
NC Y4 · CCSS 4.G.A.1
Name:Date:

Circle the correct answer.

  1. Is this angle acute, a right angle or obtuse? each angle of a regular pentagon right angle     reflex     obtuse     acute
  2. Is this angle acute, a right angle or obtuse? the angle between clock hands at 11 o'clock reflex     acute     obtuse     right angle
  3. Is this angle acute, a right angle or obtuse? the angle between clock hands at 4 o'clock obtuse     right angle     acute     reflex
  4. Is this angle acute, a right angle or obtuse? the angle between clock hands at 10 o'clock reflex     acute     obtuse     right angle
  5. Is this angle acute, a right angle or obtuse? the angle between clock hands at 1 o'clock acute     reflex     obtuse     right angle
  6. Is this angle acute, a right angle or obtuse? each angle of an equilateral triangle obtuse     acute     reflex     right angle
  7. Is this angle acute, a right angle or obtuse? the point of a slice of cake cut into 6 reflex     right angle     acute     obtuse
  8. Is this angle acute, a right angle or obtuse? the angle between clock hands at 5 o'clock right angle     reflex     acute     obtuse
  9. Is this angle acute, a right angle or obtuse? each angle of a regular hexagon reflex     obtuse     right angle     acute
  10. Is this angle acute, a right angle or obtuse? the angle between clock hands at 8 o'clock right angle     acute     obtuse     reflex
  11. Is this angle acute, a right angle or obtuse? the angle between clock hands at 9 o'clock right angle     acute     obtuse     reflex
  12. Is this angle acute, a right angle or obtuse? the corner of a square tile reflex     right angle     acute     obtuse
  13. Is this angle acute, a right angle or obtuse? each angle of a rectangle right angle     obtuse     reflex     acute
  14. Is this angle acute, a right angle or obtuse? a quarter turn acute     obtuse     reflex     right angle
  15. Is this angle acute, a right angle or obtuse? each angle of a regular octagon reflex     acute     right angle     obtuse
  16. Is this angle acute, a right angle or obtuse? the angle between clock hands at 2 o'clock reflex     acute     obtuse     right angle

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Acute and obtuse angles

Year 4 · Answer sheet

learnwith.games
NC Y4 · CCSS 4.G.A.1

Secret code joke

What has keys but can’t open locks? A PIANO

1. acute (A) · 2. obtuse (P) · 3. acute (I) · 4. obtuse (A) · 5. obtuse (N) · 6. acute (O)

Worksheet

  1. Is this angle acute, a right angle or obtuse? each angle of a regular pentagon obtuse
  2. Is this angle acute, a right angle or obtuse? the angle between clock hands at 11 o'clock acute
  3. Is this angle acute, a right angle or obtuse? the angle between clock hands at 4 o'clock obtuse
  4. Is this angle acute, a right angle or obtuse? the angle between clock hands at 10 o'clock acute
  5. Is this angle acute, a right angle or obtuse? the angle between clock hands at 1 o'clock acute
  6. Is this angle acute, a right angle or obtuse? each angle of an equilateral triangle acute
  7. Is this angle acute, a right angle or obtuse? the point of a slice of cake cut into 6 acute
  8. Is this angle acute, a right angle or obtuse? the angle between clock hands at 5 o'clock obtuse
  9. Is this angle acute, a right angle or obtuse? each angle of a regular hexagon obtuse
  10. Is this angle acute, a right angle or obtuse? the angle between clock hands at 8 o'clock obtuse
  11. Is this angle acute, a right angle or obtuse? the angle between clock hands at 9 o'clock right angle
  12. Is this angle acute, a right angle or obtuse? the corner of a square tile right angle
  13. Is this angle acute, a right angle or obtuse? each angle of a rectangle right angle
  14. Is this angle acute, a right angle or obtuse? a quarter turn right angle
  15. Is this angle acute, a right angle or obtuse? each angle of a regular octagon obtuse
  16. Is this angle acute, a right angle or obtuse? the angle between clock hands at 2 o'clock acute

learnwith.games – free to print and copy for home and classroom use. learnwith.games/printables/acute-and-obtuse-angles/