2pi*((integrate x*sqrt(1+(15/8)^2)dx from x=0..8)+(integrate x*sqrt(1+(3/4)^2)dx from x=0..8))2pi*((integrate x*sqrt(1+(15/8)^2)dx from x=0..8)+(integrate x*sqrt(1+(3/4)^2)dx from x=0..8))

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