Question

the radius of a roller is 35 cm and it length is 1.40 it takes 9.80 .complete revolution to move ones over to level a playground. find the area the of the playground

(plz ans in one min)

Answer 1

First we need to find area of roller,

Area of roller= 2πrh

where r is radius and h is height.

= 2*22/7*35*1.40= 308 cm

Now to find area of playground, we need to =

9.80*308 = 3018.4cm

Area of playground= 3018.4 cm