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Geometry 4.3 Congruent Triangles Congruent polygons - two geometric figures that have the same shape and size In these, all of the parts of one polygon are congruent to the corresponding parts or matching parts of the other. Ex 1 Show that the two polygons are congruent by identifying all congruent corresponding parts. Then write a congruence statement. Example 2 Triangle ABC is congruent to Triangle DEF. Find the values of x and y. A 7.5 75̊ 65 ̊ F 11 E 6y -14 40 ̊ B 13 C D Theorem 4.3: Third angles If two angles of one triangle are congruent to two angles of a second triangle, then the third angles of the triangles are congruent. Theorem 4.4: Properties of Triangle Congruence Triangle congruence is: reflexive symmetric transitive Homework Page 257: 4-8 all, 10, 12, 13-20 all, 28, 48-51 all