Question

I’ve missed school for about a week due to a covid vacating & when I came back we were on volumes of solids & my teacher is not good at explaining. Please help !!

Answer 1

The volume of a cylinder is given by:

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

Where:

V = Volume = 650cm³

r = Radius

h = Height = 10cm

Therefore, solve for r:

$\begin{gathered} r^2=\frac{V}{\pi h} \\ r=\sqrt[]{\frac{V}{\pi h}} \\ r=\sqrt[]{\frac{650}{10\pi}} \\ r\approx4.5\operatorname{cm} \end{gathered}$

Answer:

r = 4.5cm