1. 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).





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  • By: anil on 05 May 2019 02.07 am
    Let radius of cone = $$r$$ cm and slant height of cone = $$l=9$$ cm Curved surface area of cone = $$pi rl$$ => $$frac{22}{7} imes r imes9=99$$ => $$r=frac{99}{9} imesfrac{7}{22}$$ => $$r=frac{7}{2}=3.5$$ cm $$ herefore$$ Diameter of cone = $$2 imes3.5=7$$ cm => Ans - (B)
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