Q : 3    Curved surface area of a cone is \small 308\hspace{1mm}cm^2 and its slant height is 14 cm. Find

           (i) radius of the base 

Answers (1)

Given,

The curved surface area of a cone =  \small 308\hspace{1mm}cm^2

Slant height = l = 14\ cm

(i) Let the radius of cone be r\ cm

We know, the curved surface area of a cone= \pi rl

\therefore \\ \pi rl = 308 \\ \\ \Rightarrow \frac{22}{7}\times r\times14 = 308 \\ \Rightarrow r = \frac{308}{44} = 7

Therefore, the radius of the cone is 7\ cm

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