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The inner diameter of a circular will is...

The inner diameter of a circular will is 3.5m. It is 10m deep. Find the cost of plastering its inner curved surface at Rs. 4 per square meter.

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`r`= radius= `3.5/2=1.75 `
` h`= depth of the well=`10m`
Curved surface area
`2pirh`
`(2xx 22/7 xx1.75xx10)m^2=110m^2`
Cost of plastering = Rs` 4 per m^2`
The cost of plastering the curved surface = `Rs (110xx4)= Rs 440`
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