How do you solve this?

A circle has an area of $M\text{ cm}^2$ and a circumference of $N\text{ cm}$. If $\dfrac{M}{N}=\dfrac{1}{2}$, what is the radius of the circle, in cm?

I can't even read it...

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Area / circumference = 1/2

(pi r^2) / (2 pi r) = 1/2

r / 2 = 1/2

r = 1 cm