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Acute, right and obtuse angles.

Compare angles up to two right angles by size.

Numihana · England Year 4

Acute, right and obtuse angles

Practice sheet

Name: ______________
Date: ______________

Compare angles up to two right angles by size.

1

Is the pictured angle acute, right or obtuse?

Answer: acute / right / obtuse
2

Is the pictured angle acute, right or obtuse?

Answer: acute / right / obtuse
3

Is the pictured angle acute, right or obtuse?

Answer: acute / right / obtuse
4

Is the pictured angle acute, right or obtuse?

Answer: acute / right / obtuse
5

Is the pictured angle acute, right or obtuse?

Answer: acute / right / obtuse
6

Is the pictured angle acute, right or obtuse?

Answer: acute / right / obtuse
Numihana · England Year 4 · Acute, right and obtuse angles
Numihana · England Year 4

Acute, right and obtuse angles

Answer key

Name: ______________
Date: ______________

Compare angles up to two right angles by size.

1

Is the pictured angle acute, right or obtuse?

Answer: acute
2

Is the pictured angle acute, right or obtuse?

Answer: obtuse
3

Is the pictured angle acute, right or obtuse?

Answer: right
4

Is the pictured angle acute, right or obtuse?

Answer: obtuse
5

Is the pictured angle acute, right or obtuse?

Answer: acute
6

Is the pictured angle acute, right or obtuse?

Answer: obtuse
Numihana · England Year 4 · Acute, right and obtuse angles

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The skill behind this activity

Compare angles up to two right angles by size.

Department for Education: mathematics programmes of study ↗

Year 4 → Geometry → Properties of shapes · Selected statutory skill. Pack 2.2.0 · source checked 2026-10-12.

For teachers and parents

Compare an angle with a right angle, or use the fact that angles on a straight line total 180 degrees.

A common slip

An angle depends on the amount of turn, not the length of its arms.

Curriculum coverage

Worked example

Is the pictured angle acute, right or obtuse?

Answer: obtuse

Compare an angle with a right angle, or use the fact that angles on a straight line total 180 degrees.