Asked by Anonymous

Storm sewers are hollow cylinders with outside radius of 0.9 m and inside radius of 0.7m. If a section of storm sewer is 2.5m long, what volume of concrete is needed to make it? Please help..
Answered by Damon
cross section area = pi(.9)^2 - pi(.7)^2

volume = 2.5 * pi (.81-.49)
Answered by emily
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