Question

The cone shown has a diameter of 18 meters and a slant height of 15 meters. Which choice is closest to the lateral surface area? Use 3.14 to approximate pi.

Answer 1

The answer is 424

Nope I am not giving you an explanation :D

Answer 2

since the diameter of the cone is 18 meters, then the radius has to be half that, or 9 meters,


`\bf \textit{lateral surface area of a cone}\\\\ LA=\pi r√(r^2+h^2)~~ \begin{cases} r=radius\\ h=height\\ √(r^2+h^2)=slant~height\\ -----------\\ r=9\\ √(r^2+h^2)=15 \end{cases}\implies LA=\pi (9)(15) \\\\\\ LA=135\pi`