Question

In each example given below, radius of base of a cylinder and and its height are
given. Then find the curved surface area and total surface area.
(1) r = 7 cm, h = 10 cm ​

Answer 1

We know that,

curved Surface area of cylinder

2πrh

Total surface area 2πr( h + r )

1 step r = 7cm , h = 10cm

2πrh = 2π ×7×10 = 140π

2πr(h+r) = 2(22/7)×7 ( 10 + 7 ) = 748sq cm.