Question 1 - The diameter of a roller
is 42 cm and its length is 150 cm. It
takes 200 complete revolutions to
move once over to level a playground.
Find the area of the playground in
meter square
Answers
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Answer:
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Answered by
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Answer:
729m^2
Step-by-step explanation:
We have the diameter of a cyclindrial roller = 42 cm
⇒ The radius of cyclindrical roller (r) = 42 / 2 = 21 cm
Length of a cyclindrical roller (h) = 120 cm
Curved surface of roller = 2πrh = 2 × 22 / 7 × 21 × 120=
15840 cm2
= 15840 / 10000 m2 = 1.584 m2
Area covered by the roller in one complete revolution .
= curved surface of the roller = 1.584 m2
∴ Area of the playground = Area covered by the roller in
500 complete revolutions
= 500 × 1.584
= 792 m2
I think it's help you....
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