Question

find the surface area of the regular triangular pyramid
Round to the nearest hundredth

Answer 1

$\bf \stackrel{\textit{area of 3 standing triangles}}{3\left[ \cfrac{1}{2}(8)(18) \right]}~~+~~\stackrel{\textit{area of triangle lying down}}{\cfrac{1}{2}(8)(18)} \\\\\\ 4\left[ \cfrac{1}{2}(8)(18) \right]\implies 288$