The curved surface area of a cone is 1980 cm^2 and its radius is 21cm, what is the slanted height of a cone? (Take π = \(\frac{22}{7}\))

The curved surface area of a cone is 1980 cm^2 and its radius is 21cm, what is the slanted height of a cone? (Take π = \(\frac{22}{7}\))

(a) 25cm

(b) 28cm

(c) 35cm

(d) 30cm

This question was addressed to me in final exam.

This question is from Surface Area of a Right Circular Cone in division Surface Areas and Volumes of Mathematics – Class 9

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The curved surface area of a cone is 1980 cm^2 and its radius is 21cm, what is the slanted height of a cone? (Take π = \(\frac{22}{7}\))

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