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Unformatted text preview: 9-4 Triangles
A) Theorem 9-13 a. For every triangle, the sum of the measures of the angles is 180 i. Problem 12 from the homework 1. Given: ABC , Point A lies on a line parallel to
BC 2. Prove: A + B + C = 180 1)
2) 3) 4) ABC , Point A lies on a line parallel to BC 1) Given 2) 3) 4) 5) 6) 5) 6) B) Corollary 9-13.1 a. Given a correspondence between two triangles. If two pairs of corresponding angles are congruent, then the third pair of corresponding angles are also congruent i. C) Corollary 9-13.2 a. The acute angles of a right triangle are complementary i. D) Corollary 9-13.3 a. For any triangle, the measure of an exterior angle is the sum of the measures of the two remote interior angles Example) Given: ACB is a right angle and Prove that A BCD 1) 2) 3) 4) 5) 6)
ACB CD AB is a right angle and CD AB 1) Given 2) 3) 4) 5) 6) ...
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