Question

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

Answer 1

25 circular plates

Radius of plate = 10.5 cm

thickness = 1.6 cm

curved surface Area = (?)

volume of cylinder = (?)

$\to$ Height of the cylinder $=no.ofplates\times thickness$

$=25\times 1.6$

$=40cm$

$\to$ curved surface Area $=2\pi r.h$

$=2\pi \times 10.5\times 40$

$=2,640c{m}^2$

$\to$ volume of the cylinder $=\pi r^2.h$

$=\pi \times (10.5{)}^2\times 40$

$=13.860c{m}^3$