Question

What is the volume of a spear that has a diameter of 42 cm.

use 3.14 to approximate pi and express your answer in hundredths.

Answer 1

`R-the\ radius\ of\ the\ sphere\\\\the\ volume\ of\ the\ sphere:V=(4)/(3)\pi R^3\\the\ diameter=2R\ therefore\ R=42:2=21\ (cm)\\\\V=(4)/(3)\pi\cdot21^3=(4)/(3)\pi\cdot9,261=4\cdot3,087\pi=12,348\pi\\\\=12,348\cdot3.14\approx\boxed{38,772.72\ (cm^3)}`