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geometry math short leg long leg special right triangles leg hypotenuse 45-45-90 30-60-90 isosceles right angles triangles geoemetry altitude supplementary complementary logic median basic construction perpendicular bisector angle bisector secondary parts of a triangle congruence pythagorean theorem angle pairs converse inverse contrapositive conditional thruth table biconditional truth value radical statement conjunction disjunction negation ray segment axiomatic system theorem coplanar collinear points postulate undefined terms lines history planes radicand applications orientation pythagorean triple right triangle similarity asa triangle exterior angle sum theorem isosceles vertex triangle angle sum theorem acute triangle right triangle equiangular obtuse triangle scalene equilateral side orthocenter centroid circumcenter incenter correspondence sas sss saa cpctc two-column proofs rationalizing radicals radical expressions symmetry circle simplifying radicals operations of radicals vertical angles linear pair