The diameter of a roller is 84cm and it length is 120cm. It takes 500 complete revolutions moving once over to level a playground. What is the area of the playground?
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diameter of the roller = 84 cm
so the radius is 42 cm
height of the roller = 120 cm
curved surface area = 2πrh
= 2×22/7×42×120
= 31680 cm²
it takes 500 complete revolution
so area of the playground = 31680 ×500
=15840000 cm²
so the radius is 42 cm
height of the roller = 120 cm
curved surface area = 2πrh
= 2×22/7×42×120
= 31680 cm²
it takes 500 complete revolution
so area of the playground = 31680 ×500
=15840000 cm²
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