a circular well with a diameter of 2 metres , is dug to a depth of 4 metres . what is the volume of the earth dug out ?
"sol . volume = ∏ r ² h = [ 22 / 7 * 1 * 1 * 14 ] m ³ = 44 m ³ answer c"
volume_cylinder(divide(2, 2), 4)