Question

find the area of base and radius of a cylinder if its curved surface atea is 660 sqcm and hieght is 21 cm​

Answer 1

Step-by-step explanation:

660=2πrh

330=πr×21

330/21=πr

330/21×7/22=r

r=5

base area =πr^2

π5^2

22/7×25 = 78.5 (approx)

Answer 2

Answer:

Radius=5cm

Area=78.5cm²

Step-by-step explanation:

We know that height of cylinder is 21cm.

Also,

CSA=660cm²

Hence,

2πrh=660

r=330/(3.14x21)

r=5.004cm

Approximately,  5cm

with the value of radius now known we can use this to find the area of  base.

A=πr²

A=3.14x5x5

A=78.5cm²

I hope this helps you.

Have a great day!