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Warm Up [On back counter] Properties of Special Triangles Objective: To use and apply properties of isosceles and equilateral triangles Isosceles Triangle Vertex angle legs base Base angles If you were to construct an Isosceles Triangle you would: 1. Draw an angle, label it C 2. Mark congruent segments along each side. Label A and B 3. Connect A and B 4. Measure and label base angles. 5. Is there a pattern? C A Isosceles Triangle Theorem If two sides of a triangle are congruent, then the angles opposite those sides are congruent. ________ B Base angles Does this theorem apply to an equilateral triangle? The Isosceles Triangle Theorem applies to equilateral triangles. Example A 69 7cm E 3 cm 960 420 420 3 cm C 69 7 cm B 42 D Find the following: mA 69 mB 69 EC 3cm Isosceles Triangle Theorem Find x.