Find the area of the surface obtained by rotating the circle x^2 + y^2 = a^2 about the line y=a.

The y=a confuses me. What's the answer?

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- Oct 10th 2009, 05:00 PMjamessmithSurface Area
Find the area of the surface obtained by rotating the circle x^2 + y^2 = a^2 about the line y=a.

The y=a confuses me. What's the answer? - Oct 10th 2009, 09:38 PMVonNemo19
- Oct 11th 2009, 12:17 AMmr fantastic