EQUAL: vertical angles, alternate exterior angles, altnerate interior angles, corresponding angles, opposite angles of a parallelogram, opposite sides of a parallelogram, each angle of a rectagle, each angle of a square, sides of a square, ADD to 90: complementary angles, Add to 180: supplementary angles, linear pair, consecutive (same-side) interior, inside angles of a triangle, consecutive angles of a parallelogram, Add to 360: inside angles of quadrilateral ,

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