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.

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