Question

the radius of cylindrical roller is 140cm and its length is 100cm. it takes 500 complete revolution to level a playground completely .find area of playground​

Answer 1

Curved surface area of cylinder = 2πrh
= 2 × 22/7 × 140 × 100 = ${88000cm^2}$

area of playground = 500 × 88000
= $\boxed{44000000cm^2}$

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