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

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Properties of Special Triangles

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Presentation transcript:

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

Vertex angle Isosceles Triangle base Base angles legs

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.

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

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