vertical angles - pairs of angles that share a vertex but open in opposite directions., Acute Angle - 0 to 90° in Measure, Right angle - An angle that measures 90 degrees, Straight angle - An angle that measures 180 degrees., Obtuse angle - An angle that measures between 90 and 180 degrees., Complementary angles - Two angles that add up to 90 degrees, supplementary angles - Two angles that add up to 180 degrees., adjacent angles - Two angles that share a common vertex and a common side, but do not overlap.,

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