What is the volume of a cylinder with a cucumferance of 40 feet and a height of 20 feet?

Answer 1

The volume is

25,132.74 cubic feet

930.84 cubic yards

188,006 gallons

(all rounded)

A contributor deleted my original answer and changed it to the above.

My answer was: 2546.47909 or about 2546.5 cubic feet

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The mystery contributor strikes again, and explains:

In deriving the original answer, the first thing you did was to divide the

diameter by [ 2 pi ] to get the radius. It should have been divided by 2.

So the area of the base of the cylinder, and ultimately the volume, both

wound up underestimated by a factor of (pi)2 = about 10.

The square root of the ratio of my answer to your answer is

sqrt[ (25,132.74) / (2546.5) ] = 3.141579

That's about 0.000413% smaller than (pi) which tracks pretty well.