1958 AHSME Problems/Problem 18

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Problem

The area of a circle is doubled when its radius $r$ is increased by $n$. Then $r$ equals:

$\textbf{(A)}\ n(\sqrt{2} \plus{} 1)\qquad \textbf{(B)}\ n(\sqrt{2} \minus{} 1)\qquad \textbf{(C)}\ n\qquad \textbf{(D)}\ n(2 \minus{} \sqrt{2})\qquad \textbf{(E)}\ \frac{n\pi}{\sqrt{2} \plus{} 1}$ (Error compiling LaTeX. Unknown error_msg)

Solution

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See Also

1958 AHSC (ProblemsAnswer KeyResources)
Preceded by
Problem 17
Followed by
Problem 19
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