The height of a cone is 24 cm and radius of its base 10 cm.If the rate of painting it is Rs. 28/cm2, then what will be the total cost in painting the cone from outside?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Rs. 22880.
| Understanding/Application |
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C.S.A of cone = πrl Height = 24 cm Radius = 10 cm Rate of painting of cone = Rs. 28/cm2 |
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Applying PGT - l2 = h2 + r2 l2 = 242 + 102 = 576 + 100 = 676 l = 26 cm C.S.A of cone = πrl = [(22/7) × 10 × 26] Price of painting = 28[(22/7) × 10 × 26] = Rs. 22880 |