Question

A rectangular sheet of paper 22cm *15cm is rolled along its length to form a hollow cylinder . Find the radius of the cylinder

Answer 1

Hi there !!
Here's your answer

Dimensions of the sheet of paper :
Length = 22cm
Breadth = 15cm

This sheet is rolled along its length,
so ,
the length will be the circumference and the breadth will become the height

Thus,
Height = 15cm
Circumference = 2πr
Let the radius be r

$22 = 2 \times \frac{22}{7} \times r$


$\frac{22 \times 7}{2 \times 22} = r$

r = 7/2 cm

r = 3.5cm

Thus,
the radius is 3.5 cm

Answer 2

Answer is given in this achievement