Question

$25$ circular plates, each of radius $10.5cm$ and thickness $1.6cm$, are placed one above the other to form a solid circular cylinder. Find the curved surface area and the volume of the cylinder so formed.

Answer 1

Given object is cylinder of radius $10.5$cm and height,$l=25\times 1.6=40cm$

$C.S.A=2\pi RL=2\pi \times 10.5\times 40=2638.93c{m}^3$

$Volume=\pi R^{2}L=\pi \times (10.5{)}^2\times 40=13854.42c{m}^3$