The height of a circular cone is 24 cm and the radius of its base is 7 cm.What is the cost of painting the curved surface area of the cone at the rate of Rs. 6 per cm2 ? (Take π = 22/7)
Show answer & explanation
Correct answer: B
Explanation
Correct Answer is option 2 i.e. Rs. 3300
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Understanding |
Application |
Calculation |
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Given, Height of cone = 24 cm Radius of base = 7 cm |
So, Lateral height (l) = √(242 + 72) = 25 cm |
√(242 + 72) ⇒ √(576 + 49) ⇒ √625 ⇒ 25 |
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Curved surface area = πrl |
So, CSA = 22/7 × 7 × 25 CSA = 550 cm2 |
⇒ 22/7 × 7 × 25 ⇒ 22 × 25 ⇒ 550 |
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Rate of painting = |
So, Cost of painting = Rs. 3300 |
⇒ 550 × 6 ⇒ 3300 |