Question

the radii of two cylinder are in ratio 3:2 and their height are in ratio 5;4 calculate the ratio of CDS

​

Answer 1

Answer:

Let r

1

and r

2

be the radii of the cylinders respectively.

⇒

r

2

r

1

=

2

3

Let h

1

and h

2

be the heights of the cylinders respectively.

⇒

h

2

h

1

=

5

4

Ratio of Curved surface areas=

2πr

2

h

2

2πr

1

h

1

=

r

2

h

2

r

1

h

1

=

r

2

r

1

×

h

2

h

1

=

2

3

×

5

4

=

10

12

=

5

6

Hence,ratio of their curved surface areas is 6:5