Question

Calculate the ratio of curved surface area of 2
cylinders whose radii are in ratio 1:2 and height are
in ratio 3:5.​

Answer 1

Answer:

3 :10

Step-by-step explanation:

Let the radii of two cylinders be 1x and 2x.

Let the heights be 3x and 5x .

Now,

CSA of 1 cylinder = 2πrh

= 2 × 22/7 × x × 3x

= 44/7 × 3x^2

CSA of 2 cylinder = 2πrh

= 2 × 22/7 × 2x × 5x

= 44/7 × 10x^2

Ratio-

= (44/7 × 3x^2 ) / 44/7 × 10x^2

= 3/10

hope it will help you