acute angle - less than 90 degreees, acute, obtuse angle - less than 180 degrees , obtuse angle , straight angle - exactly 180 degrees , straight angle , congruent angle - measurement are equal, congruent angle , adjacent angle - they do not over lap, adjacent angle , vertical angle  - a pair of non adjacent angles , complementary angles - two angles that measure up to exactly 90 degrees , complementary angles, linear pair  - a pair of adjacent angles that form a straight line line meaning their non-common side are opposite rays , linear pair,

angle pairs

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