4-5 Isosceles and Equilateral Triangles - Ms. Imbery's ...

4-5 Isosceles and Equilateral Triangles

Objective

SWBAT use and apply properties of isosceles and equilateral triangles.

Important Info

What do you know about isosceles and equilateral triangles? These are the

triangles we frequently see out in the real world. In bridges, structures, art, etc.

Isosceles Triangles

? The congruent sides of an isosceles triangle are its _________. The third side

is its _________. The two congruent legs form the ___________________.

The other two angles are the ______________________.

Theorem 4-3

Isosceles Triangle Theorem

If two _________ of a triangle are _______, then the angles ______________

those sides are _________.

Theorem 4-4

Converse of the Isosceles Triangle Theorem

You tell me, what is the converse of the Isosceles Triangle Theorem?

___________________________________________________________

___________________________________________________________.

Example 1

Using the Isosceles Triangle Theorems

A) Is AB congruent to CB? Explain.

B) Is ................
................

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