Angles

  • 90° — Right Angle

  • 0° - 90° — Acute angle

  • 90° - 180° — Obtuse angle.

  • 180° - 360° — Reflex angle.


Angles are also sometimes expressed in radians, with 2 * Pi radians representing an entire revolution. A radian is therefore just over 57 degrees.


Pi itself is defined as the ratio of the circumference to the diameter for a circle. See also the separate entry for 'Pi'.
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