That's the amount of water in a round pool whose radius is 'r' .
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The surface area of a sphere is 4(3.14)R2where R is the radius of the sphere so the surface area of your dome is half of that. 2(314)R2
A = 4*pi*r2
The formula for volume of a cylinder is pi•r2•h
The area of a circle = pi*r2
C=pi times r2