angles that are in the formation of a F are equal if they are corresponding, the F sometimes isn't obvious
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The isosceles triangle theorem states that if two sides of a triangle are congruent, the angles opposite of them are congruent. The converse of this theorem states that if two angles of a triangle are congruent, the sides that are opposite of them are congruent.
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Contrapositive Cube Coordinate Geometry Coplanar Converse Convex set Coordinate Coordinate Plane Coordinatized line Corollary to a theorem Corresponding Angles Counterclockwise
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If two lines are cut by a transversal to form pairs of congruent corresponding angles, congruent alternate interior angles, or congruent alternate exterior angles, then the lines are parallel.