The diameter of a roller is 84 cm and its length is 120 cm. The roller takes 150 complete revolution to move once over a playground to level it. Find the area of the playground in square meter
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Step-by-step explanation:
Diameter = d = 84 cm
Radius = r = d/2 = 42 cm
Length = l = 120 cm
T.S.A of cylinder = 2πrh
= 2 × 22/7 × 42 × 120
= 31680 cm²
Levelled by 150 revolution = area of playground
=150 × 31680 cm²
=4, 752, 000 cm²
=475.2 m²
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