Question

If the curved surface area of the cylinder is 1320 sq cm and its height is 10 cm then find its radius.​

Answer 1

Given :

Curved surface area of a cylinder is 1320 sq cm.

Height of the cylinder = 10 cm.

To find :

It's radius =?

Formula Used :

Curved surface area of a cylinder = 2πrh.

Step-by-step explanation :

It is Given that,

Curved surface area of a cylinder is 1320 sq cm.

As We know that,

Curved surface area of a cylinder = 2πrh.

Substituting the values in the above formula, we get,

1320 = 2 × π × r × 10

20πr = 1320

πr = 1320/20

πr = 66

r = 66 ÷ (22/7) [ π = 22/7]

r = 66 × 7/22

r = 462/22

r = 21.

Therefore, Radius of the cylinder = 21 cm.

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Answer 2

radius = 21

hope it is helpful