Math CentralQuandaries & Queries


Question from mick:

i am trying to find the area of concrete to be placed around a concrete pipe! Dimensions can be 12m wide by 5m wide by 7m deep and pipe been 8m by 600mm radius...

Hi Mick. The way to solve this is to subtract the volume of the pipe from the volume of the total space.

The space is 12m x 5m x 7m which makes 420 m3.

The pipe volume is π (0.6 m)2 x 8m = 9.05 m3.

So the space surrounding the pipe is 420 - 9 = 411 cubic meters. That's a whole lot of concrete around it! Are you sure you have the measurements correct?

Stephen La Rocque.

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