Question

find the hight of a cone with the volume of 21 ft 3 and a radius of 4ft

Answer 1

the formula is

$\begin{gathered} V=\frac{\pi\times r^2\times h}{3} \\ \end{gathered}$

then

$\begin{gathered} 21=\frac{\pi\times4^2\times h}{3} \\ 21=\frac{\pi\times16\times h}{3} \\ 21=16.75h \\ \frac{21}{16.75}=\frac{16.75h}{16.75} \\ h=1.25 \end{gathered}$

answer: 1.25 ft