Question

The volume of a right circular cylinder is 4224 cu cm . Its height is 21 cm . Find the total surface area of the cylinder.

Answer 1

volume

$\pi \times {r}^{2} \times h$
4224= 22÷7×r^2×21
r^2 =64
r=8
T.S.A=
$2\pi \times r(h + r)$
=2×22÷7×8×29
=10208÷7
=1458.2