Question

if curved surface area of a cilynder is 1386cm and height is 21 cm,what will be it's radius?

Answer 1

Heya !! ☺

Let 'r' be the radius of the base of cylinder.

Height of cylinder = 21 cm

C.S.A. of cylinder = 2πrh
=> 2 × 3.14 × r × 21
=> 42 × 3.14 × r
=> 131.88 × r

Now, C.S.A. of cylinder = 1386 cm (given)

1386 = 131.88 × r
=> r = 1386/131.88
=> r = 10.5 cm

Answer 2

Heya here is your ans....

please check the image hope it helps u