AI generatedGeometry and measuresKS3 / GCSE

Classifying acute, obtuse and reflex angles

Classifying acute, obtuse and reflex angles.

  • Use the stated properties and diagram markings, rather than judging by appearance.
  • Matching ticks mean equal lengths; matching arrows mean parallel lines.
  • A small square marks a right angle. Keep labels horizontal and include units.

Example 1

Classify the angle.

Angle with a labelled vertexBAC35°
Acute.

Acute: between 0° and 90°. Obtuse: between 90° and 180°. Reflex: between 180° and 360°.

Example 2

Classify the angle.

Angle with a labelled vertexQPR120°
Obtuse.

Acute: between 0° and 90°. Obtuse: between 90° and 180°. Reflex: between 180° and 360°.

Your turn

Question 1

Classify the angle.

Angle with a labelled vertexBAC235°
Check answer
Reflex.

Acute: between 0° and 90°. Obtuse: between 90° and 180°. Reflex: between 180° and 360°.

Question 2

Classify the angle.

Angle with a labelled vertexQPR36°
Check answer
Acute.

Acute: between 0° and 90°. Obtuse: between 90° and 180°. Reflex: between 180° and 360°.

Question 3

Classify the angle.

Angle with a labelled vertexBAC121°
Check answer
Obtuse.

Acute: between 0° and 90°. Obtuse: between 90° and 180°. Reflex: between 180° and 360°.

Question 4

Classify the angle.

Angle with a labelled vertexQPR236°
Check answer
Reflex.

Acute: between 0° and 90°. Obtuse: between 90° and 180°. Reflex: between 180° and 360°.

Question 5

Classify the angle.

Angle with a labelled vertexBAC37°
Check answer
Acute.

Acute: between 0° and 90°. Obtuse: between 90° and 180°. Reflex: between 180° and 360°.

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