The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions moving monce over to level a playground. What is the area of the playground?
Given,
Diameter of roller = 84 cm
Radius of roller = 
Length of roller = 120 cm
So,
Curved surface area of roller = 
No. of revolution it takes to leve
Hence,
Area of play ground = 500 × 31680 = 15840000 cm2 = 1584 m2
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