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Honors Math 2 Isosceles Triangles Name: Date: Definition of Isosceles Triangle: A triangle with at least two congruent sides. Isosceles Triangle Theorem (ITT): If a triangle has two equal sides, then the base angles (the angles opposite those sides) are congruent. Given: Isosceles ∆𝐴𝐵𝐶 with base 𝐴𝐶 Prove: ∠𝐴 ≅ ∠𝐶 (Hint: Construct the angle bisector of the vertex angle - ∠𝐵) Converse of the Isosceles Triangle Theorem (Converse of ITT) State and prove the converse of the ITT If ______________________________________________________________________ then ___________________________________________________________________. Given: Diagram: Prove: Equilateral Triangles: Prove that the angles of an equilateral triangle are equal to 60∘ . Homework: p. 493-494 #8 p. 497 #3, 5, 8 (Note: Write two-column or paragraph style proofs. You do not need to write flow chart or reverse list proofs)