If the ratio of the circumference of the base of a right circular cone of radius r to its height is ...........

Quantitative Aptitude (CDS) Mensuration 2D

If the ratio of the circumference of the base of a right circular cone of radius r to its height is 3 : 1, then what is the area of the curved surface of the cone?

3 $\pi$ r²

$\frac{2\pi r^{2}\sqrt{4\pi^{2}+9}}{3}$

$\frac{\pi r^{2}\sqrt{\pi^{2}+1}}{3}$

$\frac{\pi r^{2}\sqrt{4\pi^{2}+9}}{3}$

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Explanation:

According to question 2 πr/h = 3/1

h = 2/3 πr

Curved surface area of cone = πrl = πr √(h²+r²)

= πr √ (4/9*π² r²+ r²) = {πr²√4 π²+9}/3

By: Munesh Kumari

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If the ratio of the circumference of the base of a right circular cone of radius r to its height is ...........

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Explanation:

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