Geometry

Question Analysis:
Tests the understanding of angle properties in an isosceles triangle.

Key Concept Explanation:
An isosceles triangle has two equal base angles, but the third angle (the vertex angle) can be different.
Only in an equilateral triangle are all angles equal.

Step - by - Step Solution:
In an isosceles triangle, if the equal sides are AB and AC, then the angles opposite these sides,  and 

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