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Classifying angles worksheets

Each question shows a measured angle. Learners compare it with 90°, then name it as acute, right, or obtuse.

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Geometry practice

Right triangles practise area. Composite L-shapes support area and perimeter.

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Classifying angles worksheets
Name: ____________________Date: ____________________
1.Is the 50° angle acute, right, or obtuse?
2.Is the 135° angle acute, right, or obtuse?
3.Is the 85° angle acute, right, or obtuse?
4.Is the 30° angle acute, right, or obtuse?
5.Is the 25° angle acute, right, or obtuse?
6.Is the 15° angle acute, right, or obtuse?
7.Is the 90° angle acute, right, or obtuse?
8.Is the 10° angle acute, right, or obtuse?
9.Is the 145° angle acute, right, or obtuse?
10.Is the 55° angle acute, right, or obtuse?
11.Is the 130° angle acute, right, or obtuse?
12.Is the 140° angle acute, right, or obtuse?
13.Is the 165° angle acute, right, or obtuse?
14.Is the 115° angle acute, right, or obtuse?
15.Is the 120° angle acute, right, or obtuse?
16.Is the 100° angle acute, right, or obtuse?
17.Is the 170° angle acute, right, or obtuse?
18.Is the 80° angle acute, right, or obtuse?
19.Is the 60° angle acute, right, or obtuse?
20.Is the 150° angle acute, right, or obtuse?
Answer key
1. acute
2. obtuse
3. acute
4. acute
5. acute
6. acute
7. right
8. acute
9. obtuse
10. acute
11. obtuse
12. obtuse
13. obtuse
14. obtuse
15. obtuse
16. obtuse
17. obtuse
18. acute
19. acute
20. obtuse
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What this worksheet includes

Each question shows a measured angle. Learners compare it with 90°, then name it as acute, right, or obtuse.

  • 20 questions by default
  • Angles range from 5° to 175°
  • Every measure is a multiple of 5°
  • Answers are acute, right, or obtuse

Choosing a practice session

  • Comparing angles with 90°
  • Learning angle vocabulary
  • Checking classification before drawing

Content reviewGeneration rules and examples reviewed 29 September 2026. Found a problem? Send a correction

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Before or after this skill

Area and perimeter worksheetsPrint free area and perimeter worksheets for grades 3–6, including missing sides, triangles, and composite L-shapes, with worked answers.
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