The top two nets represent the triangular prisms that are attached to the bases of a rectangular prism. The composite figure is
composed of all three prisms. The shaded areas are faces that are shared between the prisms. What is the total surface area of the composite figure? 78 square units
144 square units
282 square units
342 square units
I beleive since we are connecting midpoints you divide each side by 2 and add them all up to get the perimeter of the smaller triangle made with the ratio of 1:2
