Question

The diameter of a roller is 84 cm and its length is 120 cm. The roller takes 150 complete revolution to move once over a playground to level it. Find the area of the playground in square meter

Please answer my question as soon as possible because it is very important for me

And please explain the answer ​

Answer 1

All u need to do find the CSA of roller with radius 42cm and height 120cm and multiply it with 150. This will give you the total area.

CSA x 150= 2(pie)rh x 150

2 x 22/7 x 42 x 120 x 150 = 4752000cm^2

Since You need to find the area in metre square... divide the area by 100 x 100...

4752000 / 10000 = 475.2 m^2

Hope it helped you....