Question

A roll of news paper of length 7000 m and thickness 0.022 cm is rolled into a solid cylinder, then its
radius is​

Answer 1

Answer:

Spread out into a rectangular sheet, the newspaper is a very thin rectangular solid with length 7000, width x, and thickness 0.00022. The volume is then 1.54x cubic meters. ... The radius of the roll of newspaper is approximately 0.7m.

Answer 2

The sheet of paper is in the shape of a cuboid Therefore

Volume of the cuboid=Volume of the cylinder

or 7000×100×h×0.022=

7

22

r

2

h

(Since length is given in meters it is converted into centimeters by multiplication with 100)

or r

2

=

22

7000×100×0.022×7

=70×70

or r=70 cm