Question

A cylinder and its dimensions are shown in the diagram.
5 in.
in.
Which equation can be used to find V, the volume of the cylinder in cubic inches?

Answer 1

well, from the picture, we can see the cylinder has a diameter of 5 and thus it has a radius of half that, or 2.5, and a height of "h", so

$\textit{volume of a cylinder}\\\\ V=\pi r^2 h~~ \begin{cases} r=radius\\ h=height\\[-0.5em] \hrulefill\\ r=2.5 \end{cases}\implies V=\pi (2.5)^2 h$