Solver FIND volume of a sphere

Source code of 'FIND volume of a sphere'

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==section input Find volume of sphere with radius *[input r=2] ==section solution perl $v = 4/3*3.1415926*$r*$r*$r; print "Volume of a sphere {{{V=(4/3)*pi*r^3 = (4/3)*pi*$r^3 = $v}}}"; ==section output v ==section check

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