The volume is 30.68 cubic inches. To calculate volume of a cylinder (or tube), multiply the lenght by the surface area. To calculate the surface area, multiply the radius (1/2 of the diameter) by itself and then by 3.1416 (r-squared x pi).
Solution: 5/8 dia = .625 dia; 1/2 of .625 is .3125 (radius)
.3125 x .3125 x 3.1416 = .3067969 (this is the surface area)
.3067967 x 100 (length) = 30.67967 (rounded = 30.68 cu in)
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