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What is the surface area of a cone with the diameter of 12 meters and a slant height of 13.4 meters?

User Phinz
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1 Answer

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\begin{gathered} SA=\pi rs+\pi r^2 \\ Common\text{ factor} \\ SA=\pi r(s+r) \\ r=(diameter)/(2)=(12m)/(2)=6m \\ r=6m \\ s=13.4m \\ Hence \\ SA=\pi r(s+r) \\ SA=\pi(6m)(13.4m+6m) \\ SA=365.68m^2 \\ The\text{ surface area is 365.68m}^2 \end{gathered}

User Depado
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