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"Find the area of the surface obtained by revolving the curve $r=\cos \theta$, $ 0 < \theta < \pi $ about the polar axis. What is the arc length of this curve?"

I know how to find the arc length, but I'm not sure what it means to revolve around the polar axis.

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Hint...the curve is a circle of radius $\frac 12$

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    $\begingroup$ The OP stated, "I know how to find the arc length, but I'm not sure what it means to revolve around the polar axis. " $\endgroup$ – N. F. Taussig Apr 16 '18 at 12:18

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