null angle - zero degrees, acute angle - between zero and less than 90 degrees, right angle - 90 degree angle, obtuse angle - between 90 degrees and 180 degrees, straight angle - 180 degrees, reflex angle - between 180 degrees and less than 360 degrees, full revolution - 360 degrees, complementary angles - a pair of angles that add up to 90 degrees, supplementary angles - a pair of angles that add up to 180 degrees,

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