Height of a right circular cone is 28 cm. If diameter of its base is 42 cm, then what will be the curved surface area of the cone?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 2310 cm2
| Understanding/Application |
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Height of cone = 28 cm Diameter of the base of cone = 42 cm Radius of the base of cone = d/2 = 42/2 = 21 cm CSA of cone = πrl l = slant height |
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l2 = r2 + h2 = 212 + 282 = 441 + 784 = 1225 l = 35 cm CSA of cone = πrl = [(22/7) × 21 × 35] = 2310 cm2 |