Question

Haw many cudir metres of earth must be dug out to sink a will of 22.5m deep and dimater3.5Also find 4.5
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Answer 1

Answer:

1485

....................

Answer 2

Step-by-step explanation:

Volume of earth to be dug out = Volume of the well.

= \frac{22}{7} \times \frac{7}{2} \times \frac{7}{2} \times {22.5 \: m \: }^{3} = {866.25 \: m \: }^{3} =

7

22

×

2

7

×

2

7

×22.5m

3

=866.25m

3

Area of the inner curved surface =2πrh

= 2 \times \frac{22}{7} \times \frac{7}{2} \times {22.5 \: m \: }^{2} = {495 \: m \: }^{2} =2×

7

22

×

2

7

×22.5m

2

=495m

2

Cost of plastering the inner curved surface Rs

= Rs \: (495 \times 3) = Rs \: 1485.=Rs(495×3)=Rs1485.