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An angle is a two-dimensional geometric figure that consists of two rays with a common starting point.

Measures of angles are often used with circles and trigonometry measured in either radians or degrees..

Types

  • acute angle - measures between 0 and 90 degrees
  • right angle - measures exactly 90 degrees
  • obtuse angle - measures more than 90 and less than 180 degrees
  • straight angle - measures exactly 180 degrees
  • reflex angle - measures between 180 and 360 degrees
  • perigon angle - measures 360 degrees
  • coterminal angle - measures greater than 360 degrees
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