In an isosceles triangle with , if , what is the measure of ...

Question Analysis:
This question involves the properties of isosceles triangles and the sum of interior angles of a triangle.
The main focus is on using the fact that in an isosceles triangle, the base angles are equal and then applying the angle - sum property of a triangle.

Key Concept Explanation:
In an isosceles triangle, if two sides are equal (e.g.,

), then the angles opposite those sides are equal.
So, in

with

.
Also, the sum of the interior angles of any triangle is

, i.e.,

.

Step - by - Step Solution:
Since

and

(because

), then

.
We know that

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