Step-by-step explanation:
It's not 3 triangles and 1 square because you need four triangles to make the siding and the square wont go anywhere because of how it's going to look.
It's not 3 triangles and 1 rectangle because still you need four to make the sides and a rectangle is too long.
4 triangles and 1 rectangle is still not correct because the rectangle on the bottom of the net is going to mess it up fir the whole shape.
So in conclusion, 4 triangles and 1 squares is the correct answer.
