vertex - corner of an angle, null angle - an angle of zero degrees, protractor - used to measure an angle, acute angle - an angle greater than zero and less than 90 degrees, right angle - an angle of 90 degrees, obtuse angle - an angle greater than 90 degrees but less than 180 degrees, ordinary angle - any angle less than 180 degree, straight angle - a straight line or an angle that is exactly 180 degrees, reflex angle - an angle larger than 180 but smaller than 360 degrees, full angle/complete revolution - an angle who measures 360 degrees, complementary angles - a pair of angles that add up to 180 degrees,

Geometry: Angles

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