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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Answer:
Given,
Diameter = d = 84cm
Radius = r = d/2 = 42cm
Length = l = 120 cm
T.S.A of cylinder = 2πrh
= 2 x 22/7 x 42 x 120
= 31680 cm²
Area levelled by 500 revolution = Area of playground
= 500 x 31680cm²
= 15840000 cm² [ change into m]
= 1584 m²
Step-by-step explanation:
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Answered by
1
Step-by-step explanation:
Radius of the roller (r)=
84/2cm=42cm
length of the roller (h)=120cm
∴ Area of the playground levelled in taking 1 complete revolution 2πrh
=2×227×42×120=31680cm
∴ Area of the playground
= 31680×150 = 4752000 cm²
4752000/100×100 m²
475.2m²
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