12.1 Triangles by angles

Triangles are 3-sided figures. There are tons.

One way to classify triangles is by the size of its angles.

  • Right-angled triangles are triangles with a right or 90° angle
  • Acute-angled triangles are triangles where all 3 angles are acute
  • Obtuse-angled triangles are triangles where 1 angle is obtuse

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