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Find the cost of plastering the inner surface of a well at Rs. 9.50 per m2, if it is 21 m deep and diameter of its top is 6 m. |
Answer» Given, Height of cylinder = 21 m Diameter of cylinder = 6 m Radius of cylinder = \(\frac{6}{2}\) = 3 m So, Curved surface area of cylinder = 2πrh = 2 x \(\frac{22}{7}\) x 3 x 21 = 396 m2 ∴ Cost of plastering the inner surface at rate Rs.9.50 per m2 = 396 × 9.50 = Rs. 3762 |
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