Answer
$\dfrac{3960}{7}=565.2 \space cm^3$
Work Step by Step
Formula to calculate the volume of a right circular cylinder is:
Volume, $V=\pi r^2 H$ ...(1)
Given: $d=6 \space cm$ and $H= 20 \space cm$
As we know $r=\dfrac{d}{2}$
Thus, $r=3 \space cm$
From equation (1), we have
Volume, $V=\pi r^2 H$
Volume, $V=\dfrac{22}{7} (3)(20)=\dfrac{3960}{7}=565.2 \space cm^3$
