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Angles can be classified by size:

  • Acute angle: between 0° and 90°
  • Right angle: equal to 90°
  • Obtuse angle: between 90° and 180°
  • Straight angle (line): equal to 180°
  • Reflex angle: between 180° and 360°

In a shape, an angle can be an interior angle or an exterior angle.

Angles that sum to 90° are called complementary angles.

Angles that sum to 180° are called supplementary angles.

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11y ago

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