InterviewSolution
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InterviewSolution
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ded from the remaining part of the road, by using 50 hollowcled cardboard. Each cone has a base diameter of 40 cm and heige of each of the cones is to be painted and the cost of painting i, what will be the cost of painting all these cones? (Use π = 3.14 and talbus stop is barricadedof then. If the outer side12 per4.02) |
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Answer» Radius of the cone (r) = 40/2 cm = 20 cm = 0.2 mHeight of the cone (h) = 1 mLet l be the slant height of a cone.∴ l = √h2+ r2⇒ l = √12+ 0.22⇒ l = √1.04⇒ l = 1.02 mRate of painting =₹12 perm2 Curved surface of 1 cone = πrlm2 = (3.14 × 0.2 × 1.02)m2 = 0.64056m2Curved surface of such 50 cones = (50 × 0.64056)m2 = 32.028m2Cost of painting all these cones =₹(32.028 × 12) =₹384.34 |
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