1. Isosceles Triangle Theorem (Base Angles Theorem)
If two sides of a triangle are congruent (isosceles triangle), then the angles opposite them are congruent A B C

2. J K L
Given:
Prove M
Statements
Reasons
1. M as the midpoint of
1. Definition of a median 2.
2. Definition of a midpoint 3.
3. Given 4.
4. Reflexive Property 5. 5. 6. 6.

3. Converse of the Isosceles Triangle Theorem (Converse of the Base Angles Theorem)
If two angles of a triangle are congruent, then the sides opposite them are congruent B C A

4. J K L
Given:
Prove M
Statements
Reasons 1.
1. Definition of an angle bisector 2.
2. Reflexive Post 3.
3. Given 4. 4. 5. 5.