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
a) 7 cm
b) 140 cm
c) 35 cm
d) 70 cm​

Answer 1

Answer:

d) 70 cm

Step-by-step explanation:

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