The curved surface area and the slant height of a right circular cone are 99 cm2 and 9 cm respectively. Find its diameter (in cm).
Let radius of cone = $$r$$ cm and slant height of cone = $$l=9$$ cm
Curved surface area of cone = $$\pi rl$$
=> $$\frac{22}{7}\times r\times9=99$$
=> $$r=\frac{99}{9}\times\frac{7}{22}$$
=> $$r=\frac{7}{2}=3.5$$ cm
$$\therefore$$ Diameter of cone = $$2\times3.5=7$$ cm
=> Ans - (B)
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