Question

Question 48

Two cylinders A and B are formed by folding a rectangular sheet of dimensions 20 cm×10 cm along its length and also along its breadth respectively. Curved surface area of A is ___ surface area of B.

Answer 1

Equal
For cylinder A, h = 10 cm and r $=\frac{10}{\pi }cm$
$\therefore$ Curved surface area of A $=2\pi rh=2\pi \times \frac{10}{\pi }\times 10=200c{m}^2$
Again, for cylinder B, $r=\frac{5}{\pi }cm$ and h = 20 cm
$\therefore$ Curved surface area of B $=2\pi rh=2\pi \times \frac{5}{\pi }\times 20=200c{m}^2$
Hence, the curved surface area of both the cylinders are same.