Question

the figure below is a net for a triangular pyramid. if all the triangles are equilateral what isvthe surface area of the pyramid in square ft

Answer 1

There are four equilateral triangles in the pyramid.

Determine the area of one triangle.

`\begin{gathered} A=(1)/(2)\cdot7.79\cdot9 \\ =35.055 \end{gathered}`

The total area of four equilateral triangle is equal to the surface area of pyramid.

Determine the surface area of pyramid.

`\begin{gathered} A^(\prime)=4\cdot35.055 \\ =140.22 \end{gathered}`

Thus surface area of pyramid is 140.22 square feet.