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  2. Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area.

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Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area.

Q : 1    Diameter of the base of a cone is \small 10.5 \hspace{1mm}cm and its slant height is \small 10 \hspace{1mm}cm. Find its curved surface area.
 

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N Nehul

Given, 

Base diameter of the cone = d=10.5\ cm

Slant height = l=10\ cm

We know, Curved surface area of a cone = \pi r l

\therefore  Required curved surface area of the cone=

\\ = \frac{22}{7}\times \frac{10.5}{2}\times10 \\ \\ = 165\ cm^2

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