The radius of a roller is 14 cm and its length 20 cm. It takes 235 complete revolutions to move once over to level a playground. Find the area of the playground.
(Use π = 22/7)
Explanation:
Area of the playground will be 235 times the curved surface area of the roller
= 235 × 2πrh
= 235 × 2 × 22/7 × 14 × 20
= 413600
Hence, option (d).
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