1. Properties of Special Triangles 4-5 Objective: To use and apply properties of isosceles and equilateral triangles

2. Vertex angle Isosceles Triangle base Base angles legs

3. 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 B Base angles Isosceles Triangle Theorem Theorem 4-3 If two sides of a triangle are congruent, then the angles opposite those sides are ________ congruent.

4. Does this theorem apply to an equilateral triangle? The Isosceles Triangle Theorem applies to equilateral triangles.

6. Find the following: Example 4.5 p. 254: 1-13 odd, 17, 19 BD E 42 0 C A 96 0 7 cm 3 cm 69 3cm 69 42 42 0 3 cm