Question

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

Answer 1

csa of cylinder = 2pie r h = 660 cm^2

2 × 22/7 × r × 21 = 660

2 × 22 × r × 3 = 660

66 ×2r = 660

2r = 660/66

2r= 10

r = 5

now ,

base area

pie r^2

22/7 × 25

550/7 is your base area