Supplementary angles - Two angles whose sum is 180°, Complementary angles - Two angles whose sum is 90°, Vertical angles - pairs of opposite angles made by two intersecting lines., Acute angle - angles that measure less than 90°, right angle - angles that measure exactly 90°, adjacent angles - angles that share a common vertex and side, Transversal - any line that intersects two straight lines at distinct points, Parallel Lines - lines in a plane that are always the same distance apart., obtuse angle - any angle greater than 90°, straight angle - an angle that measures exactly 180°,

Angle relationship

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