the diameter of a roller is 84 cm and its length is 120 cm It takes 500 complete Revolution to move once over to level a playground with the area of the playground in metre square is
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Answered by
32
Answer:
Hope it helps
Step-by-step explanation:
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
Answered by
5
Step-by-step explanation:
surface area of roller=2pi×r×l
=2×3.14×84×10^-2×120×10^-2
=6.3m^2
area of playground =6.3×500=3150
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