Math Playground
Geometry

Acute, right, obtuse

Less than 90°, exactly 90°, more than 90° — name angles by their size.

Angles are named by their size.

The five types

  • Acute — less than 90°.
  • Right — exactly 90°.
  • Obtuse — between 90° and 180°.
  • Straight — exactly 180°.
  • Reflex — between 180° and 360°.