Question

A roller 150cm long has a diameter of 70cm to level a playground it takes 800 complete revolution determine the coast of levelling the playground at the rate of ₹90 per square. m​

Answer 1

Answer:

⇒ Cost = ₹366.201

Step-by-step explanation:

First we will find the surface area of the roller which is a cylinder,

⇒ Surface area of cylinder = 2πrh + 2πr²

⇒ Surface of cylinder = ( 2 × 3.142 × 35 × 150 ) + ( 2 × 3.142 × 35² )

⇒ Surface area of cylinder = 32991 + 7698

⇒ Surface area = 40689cm²

Now we convert this into metres because rate is ₹90 per square METRES,

⇒ 40689 ÷ 100²

⇒ 4.0689m²

Now we find the cost,

⇒ Cost = Area × Rate

⇒ Cost = 4.0689 × 90

⇒ Cost = ₹366.201

And that's your answer! Please mark as brainliest :)

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