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QUESTION
One good way is to look at a section of the region over a very narrow RING in the x Y plane. Draw the annulus outside radius r = x2 + y 2 and inside...
One good way is to look at a section of the region over a very narrow RING in the x Y plane. Draw the annulus outside radius r = x2 + y 2 and inside radius r + dr. What does this cross section look like? Prompt for answers. It is a cylinder, with radius r and height 16 R2 . So what is its surface area?
