Question

find the volume and curved surface area of a right circular cylinder of height 21 cm and base radius 5 cm.

Answer 1

For a right circular cylinder, 
Volume = πr²h = π×5²×21 cm³ =1650 cm³
CSA = 2πrh = 2π×5×21 cm² =  660 cm²

Answer 2

Volume of a right circular triangel = π$r^{2}$h

=$\frac{22}{7}$* 5 * 5 * 21

=1650 $cm^{3}$

CSA of a right circular cylinder = 2πrh

=2 * $\frac{22}{7}$ * 5 * 21

=660 $cm^{2}$