Question

The inner diameter of a well is 4.20 meter and its depth is 10 meter. Find the inner surface area of the well. Find the cost of plastering it from inside at the rate Rs 52 per Sq. Cm
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Answer 1

Answer:

Surface area = 159.5748 square cm

Cost of plastering it from inside = 8297.88 per square meter

Step-by-step explanation:

The inner diameter of a well = 4.20 m

So radius = 4.20/ 2 m

r = 2.1 m

depth = h = 10m

We have to find the inner surface area of the well

Surface area = 159.5748 square cm

Cost of plastering it from inside be

= 52 × 159.5748

= 8297.88 per square meter

Cost of plastering it from inside = 8297.88 per square meter

Answer 2

Answer:

Pie rsquare h

22/7 *2.1*2.1*10

22*3*2.1

22*6.3

138.6 meter square

138.6*52=rupees7207.2