Noah is working on a geometry problem that involves finding the volume of a sphere with a diameter of 9 units. his work is shown below. v = πr3 v = π(9)3 v = π(729) v = 972π cubic units is noah’s work correct? explain. a)yes, noah’s calculations are correct. b)no, noah did not simplify correctly. c)no, noah used the diameter instead of the radius in the calculations. d)no, noah did not use the correct formula for volume of a sphere.