Acute angle, an angle that measures greater than 0° and less than 90, Obtuse angle, any angle greater than 90°, Straight angle, an angle of 180°, Right angle, An angle that is exactly equal to 90 degrees, Complementary angles, either of two angles whose sum is 90°., Supplementary angles, either of two angles whose sum is 180°., Vertical angles, each of the pairs of opposite angles made by two intersecting lines., Adjacent angles, The angles are right next to each other , Congruent, Equal .

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