Given: 

Find: 

To find:
BC.
Given:
In an isosceles
Theorem used:
Angle bisector theorem:
If a ray bisects one angle of a triangle, then it divides the opposite side into segments whose lengths are proportional to the lengths of the two sides that form the bisected angle.
Calculation:
Consider an isosceles
We have
Since
We know that the sum of angles in a triangle is
Thus
Consider the
That is,
Hence
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