1954 AHSME Problem 5

A regular hexagon is inscribed in a circle of radius 10 inches. Its area is:

\textbf{(A)}\ 150\sqrt{3} \text{ sq. in.} \qquad \textbf{(B)}\ \text{150 sq. in.} \qquad \textbf{(C)}\ 25\sqrt{3}\text{ sq. in.}\qquad\textbf{(D)}\ \text{600 sq. in.}\qquad\textbf{(E)}\ 300\sqrt{3}\text{ sq. in.}

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.