Question

A rectanglegular sheets of paper 40cmX22cm is rolled to form cylinder of hight 40 cm then the radius of cylinder is

Answer 1

Step-by-step explanation:

height = 40 cm (length of the rectangle)

radius =?

circumference = 22cm (breath of the rectangle)

• $2\pi \times r = 22$

2×22÷7×r =22

r = 3.5 cm

Answer 2

Answer:

r=3.5cm

Step-by-step explanation:

sheets of paper =40cm×22cm

=880cm^2

Csa of cylinder =2πrh

880cm^2 = 2×22/7×r×40

880×7

2×22×40 = r

7/2 =r

3.5cm=r