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### 12 Cards in this Set

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 The side opposite the vertex angle in an isosceles triangle Base Abbreviation for 'corresponding parts of congruent triangles are congruent" CPCTC A theorem that follows directly from another theorem and that can easily be proved from that theorem Corollary A triangle with at least two congruent sides Isosceles triangle The two congruent sides of an isosceles triangle Legs of an isosceles triangle The angle opposite the base of an isosceles triangle Vertex Angle The theorem or postulate that states: If the sides of one triangle are congruent to the sides of another triangle, then the two triangles are congruent SSS The theorem or postulate that states: If two sides and their included angle in one triangle are congruent to two sides and their included angle in another triangle, then the two triangles are congruent SAS The theorem or postulate that states: If two angles and their included side in one triangle are congruent two angle angles and their included side in another triangle, then the two triangles are congruent ASA The theorem or postulate that states: If two angles an a nonincluded side of one triangle are congruent to the corresponding angles and nonincluded side of another triangle, then the triangles are congruent AAS The theorem or postulate that states: If the hypotenuse and a leg of a right triangle are congruent to the hypotenuse and corresponding leg of another right triangle, then the two triangles are congruent HL The theorem or postulate that states: If two sides of a triangle are congruent, then the angles opposite those sides are congruent Isosceles Triangle Theorem