Question

A rectangle of length 14 cm and breadth 7 cm is folded into a right circular cylinder. How many revolutions does the cylinder need to make to cover an area of 784 sq.Cm

Answer 1

n = 8

Explanation:

Given that,

Length and breadth of a rectangle are 14 cm and 7 cm.

The area of rectangle is given by :

`A=l* b\\\\A=14* 7\\A=98\ cm^2`

Let n be the number of revolutions the cylinder need to make to cover an area of 784 sq.cm.

So,

`n=(784)/(98)\\\\n=8`

Hence, there are 8 revolutions.