162) Alternate Exterior Angles Converse If two lines are cut by a transversal so the alternate exterior angles are congruent, then the lines are parallel. 155) Alternate Interior Angles Converse If two lines are cut by a transversal so the alternate interior angles are congruent, then the lines are parallel. 155) Consecutive Interior Angles Theorem If two parallel lines are cut by a transversal, then the pairs of consecutive interior angles are supplementary.
155) Alternate Exterior Angles Theorem If two parallel lines are cut by a transversal, then the pairs of alternate exterior angles are congruent. 125) Vertical Angles Congruence Theorem Vertical Angles are congruent Alternate Interior Angles Theorem If two parallel lines are cut by a transversal, then the pairs of alternate interior angles are congruent. 125) Congruent Complements Theorem If two angles are complementary to the same angle (or to congruent angles), then the two angles are congruent.
124) Congruent Supplements Theorem If two angles are supplementary to the same angle (or to congruent angles), then the two angles are congruent. 113) Right Angles Congruence Theorem All right angles are congruent. Transitive: If AB ≃ CD and CD ≃ EF, then AB ≃ EF. 720) Properties of Congruence Congruence is reflexive, symmetric, and transitive. 381) Area Congruence Postulate If two polygons are congruent, then they have the same area.
Angle-Angle (AA) Similarity Postulate If two angles of one triangle are congruent to two angles of another triangle, then the two triangles are similar.
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