which of the following describes a valid method for calculating the surface area of a triangular prism?
a. decompose the triangular prism into two triangles and three rectangles. Find the sum of the area of one triangle and three times the area of one rectangle.
b. decompose the triangular prism into two triangles and three rectangles. Find the sum of the area for all five shapes.
c. decompose the triangular prism into three triangles and two rectangles. Find the sum of the area for all five shapes.
d. decompose the triangular prism into three triangles and two rectangles. Find the sum of the three times the area one triangle and twice the area of one rectangle.