straight angle - an angle whose measure is 180º, right angle - an angle whose measure is 90º, supplementary angles - two angles whose measures have a sum of 180º, complementary angles - two angles whose measures have a sum of 90º, vertical angles - a pair of opposite angles formed when 2 lines intersect at a point, perpendicular angles - two lines that intersect at a right angle, parallel lines - two lines in the same plane that do not intersect,

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