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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