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# Help! I'm confused

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Trapezoid $ABCD$ is inscribed in the semicircle with diameter $\overline{AB}$, as shown below. If $CD = 7$, $AD = 3$, and $BC = 3$, then find the radius of the semicircle.

I tried and searched but nothing was correct

Sep 7, 2021

The radius of the semicircle is $\frac{\sqrt{85}}{2}$.