Question

A rectangular sheet paper 40cm×22cm is rolled to form of a hollow cylinder of height 40cm .Find the radius of the cylinder​

Answer 1

Step-by-step explanation:

Rectangle sheet area 40 * 22 = 880 cm^2

Hollow cylinder curved surface area

= 2 * Π * r * h

as question

2 * Π * r * 40 = 880

or 2 * Π * r = 22

or 2 * 22/7 * r = 22

or r = 7/2 = 3.5

Radius is 3.5 cm