Question

the diameter of a roller is 84cm and its length is 120cm . It takes 500 complete revolution to move once over to level a playground . the area of the playground in metre square is:-

Answer 1

i hope this will usful to u

Answer 2

Given,
Diameter = d = 84cm
Radius = r = d/2 = 42cm
Length = l = 120 cm
T.S.A of cylinder = 2πrh
                           = 2 x 22/7 x 42 x 120
                           = 31680 cm²
Area levelled by 500 revolution = Area of playground
= 500 x 31680cm²
= 15840000 cm² [ change into m]
= 1584 m²