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How Many Cubic Meters of Earth Must Be Dug Out to Make a Well 28 M Deep and 2.8 M in Diameter ? Also , Find the Cost of Plastering Its Inner Surface Ata Rs 4.50 per Sq.Meter. - Mathematics

Sum

How many cubic meters of earth must be dug out to make a well 28 m deep and 2.8 m in diameter ? Also , find the cost of plastering its inner surface ata Rs 4.50 per sq.meter. 

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Solution

`"Radius of the well"=2.8/2=1.4 m`

`"Depth of the well"=28m`

`"Therefore, volume of earth dug out "= pir^h`

`=22/7xx1.4xx1.4xx28` 

`=17248/100`

`=172.48 m^2`

`"Area of curved surface"=2pirh`

`=2xx22/7xx1.4xx28`

`=246.40 m^`

Cost of plastering the rate of Rs 4.50 per sq m 

`= Rs. 246.40xx450`

`= Rs 1108.80`

 

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APPEARS IN

Selina Concise Maths Class 10 ICSE
Chapter 20 Cylinder, Cone and Sphere
Exercise 20 (A) | Q 4 | Page 297
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