The base of a solid is the unit circle x^2 + y^2 = 4, and its cross-sections perpendicular to the x-axis

are rectangles of height 10. Find its volume.

Here's my work:
A for rectangle=lw
A=10*sq(4-x)

V= the integral from -4 to 4 of sq(4-x^2)*10dx
But that gets me 0, so I know I am wrong. Please help!

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