Question

A rectangualr paper is 22 cm length and 10 cm width it is rolled into cylinder find its surface area

Answer 1

surface area of cylinder = area of rectangle

Area of rectangle = length × breadth

22 cm × 10 cm = 220 cm²

Or

let the length of rectangle be height of cylinder and breadth be circumference.

curved surface of cylinder = 2πrh

[circumference of circle = 2πr = 10cm]

curved surface area = 10×22 =220 cm²