Download Isosceles Triangle Theorem Isosceles Triangle Base

Geometry
Name:
Isosceles Triangle Theorem
Isosceles Triangle Base Angle Theorem: If two sides of a triangle are congruent, then the angles
opposite those sides are congruent.
Converse of Isosceles Triangle Base Angle Theorem: If two angles of a triangle are congruent, then
the sides opposite those angles are congruent.
DIRECTIONS: In each of the following examples, find the value of x.
Practice Problems:
1.
4.
2.
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3.
6.
For questions 7-9, use the following diagram:
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For questions 10-12, use the following diagram. Given the two congruent angles, name two
segments that must be congruent.
10.
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12.