Revolution - One complete turn of 360 degrees, Straight angle - an angle equal to 180 degrees, right angle - an angle equal to 90 degrees, Acute - an angle between 0 degrees and 90 degrees, Obtuse - an angle between 90 degrees and 180 degrees, Reflex angle - an angle between 180 degrees and 360 degrees, congruent angles - equal to each other, adjacent angles - They have a common side and a common vertex, supplementary angle - An angle that adds up to 180 degrees, An angle that adds up to 180 degrees - supplementary angle,

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