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Solve for x. Sides of the triangle are tangent to the circle.

 

 Mar 20, 2021
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Notice that you can form a square in the left corner with side lengths of 5, as shown below. Lines that are tangent to a circle and meet at a point are congruent, so we can label the triangle as shown above. Then, it's just the Pythagorean theorem:

\(18^2+(5+x)^2=(13+x)^2\)

I think you can take it from here.

 Mar 21, 2021

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