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Chapter 4 Section 4.2 Objectives • Discover a relationship between the base angles of an isosceles triangle. Properties of Special Triangles Vertex angle Legs Base angles Base Investigation Base Angles in an Isosceles Triangle p. 205 Isosceles Triangle Conjecture If a triangle is isosceles, then its _______________. base angles are congruent Investigation Is the Converse True? p. 206 Converse if the Isosceles Triangle Conjecture If a triangle has two congruent angles, then it is an isosceles triangle _______________.