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Question:

The diameter of a roller is 84cm and its length is 120cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in m²

Solution:

Given:Height=120cm,R=84/2=42cm⇒CSA=2πrh=2×22/7×42×120cm²=31680cm²⇒Area=500×CSA=500×31680cm²=15840000cm²=15840000/10000m²=1584m²