Geometry

The answer is D. 56.

 

1. Since , their lengths are equal:

Set up the equation .

Subtract from both sides of the equation:

, which simplifies to .

 

Add 5 to both sides of the equation:

, resulting in .

 

Divide both sides by 2:

, so .

 

2. Now find the lengths of and :

For , substitute into the expression

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