Question

maths question surface area and volume​

Answer 1

Given

h of CYLINDER = 21cm

CSA of cylinder= 660 CM2

Let r be radius of cylinder

CSA of cylinder = 2pirh

660=2 *22/7*r*21

660=2*22*3*r

660= 132*r

r = 660/132

r = 5cm

Now area of its base will

=>Pir2

=> 22/7*5*5

=>22/7*25

=>550/7 cm2 or 78.571 cm2

Hope it will help u buddy

Pls mark it as brainliest ans brother.

Answer 2

csa=2πrh
660=2(22divided by 7)(r) *21
660divided by 21=44/7*r
31.4=6.2*r
r=31.4/6.2
=5.06cm