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The lateral surface area of a right circular cone is 2020 cm^2 and its radius is 10 cm. What is its slant height?

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The lateral surface area of a right circular cone is 2020 cm^2 and its radius is 10 cm. What is its slant height?

(a) 28.3 cm

(b) 25.6 cm

(c) 68.23 cm

(d) 64.33 cm

The question was posed to me during an interview.

My query is from Surface Area and Volume of Different Solid Shapes in division Surface Area and Volumes of Mathematics – Class 10

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Right answer is (d) 64.33 cm

Explanation: The lateral surface area of a right circular cone is 2020 cm^2.

πrl = 2020

3.14 × 10 × l = 2020

l = \(\frac {2020}{3.14 \times 10}\)

= 64.33 cm

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