A triangular pyramid has a slant height of .75 foot. The equilateral triangular base has a perimeter of 1.2 feet and an area of about .07 square foot. Find the approximate surface area.
So the figure is a tetrahedron?
surface area = (1/2)(perimeter of base)(slant height) + (area of the base)
surface area = (1/2)(1.2)(0.75) + 0.07
surface area = 0.45 + 0.07
surface area = 0.52 square feet