Abbreviations that we use in order to understand some mathematical statements in the content of given material. AA Angle-Angle ASA Angle-Side-Angle AAS Angle-Angle-Side add. Addition adj. adjacent alt. altitude, alternate ax. axiom CASTC Corresponding angles of similar triangles are congruent cm centimeters cm 2 square centimeters cm 3 cubic centimeters comp. complementary corr. corresponding cos cosine cot cotangent CPCTC corresponding parts of congruent triangles are congruent csc cosecant CSSTP corresponding sides of similar triangles are proportional diag. diagonal eq. equality exs. exercises ext. exterior ft foot (or feet) gal gallon HL hypotenuse-leg (proves