Mensuration Practice Test 1

Question : 33 of 40

Marks: +1, -0

Find the cost of plastering the surface of a well which is 21 m deep and 4 m in diameter at Rs 1.50 per sq. m.

Solution:

Surface area of the well = 2πrh
= 2 ×

{22}/7

× 2 × 21 =

264 m^2

Cost of plastering = 264 × 1.50 = Rs 396

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