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The drawing shows an isosceles triangle $PQR$. Each vertex of triangle $PQR$ is a point on circle $O$. If the circumference of circle $O$ is $10\pi$ units, what is the area of triangle $PQR$? $\text{Area}_{\text{triangle}} = \frac{1}{2} bh$ $\newline$A $100$ sq units $\newline$B $50$ sq units $\newline$C $30$ sq units $\newline$D $PQR$$0$ sq units