One possible two-dimensional figure that can result from slicing a right rectangular pyramid perpendicular to its side is a rectangle. If the slice is taken at a height h from the base of the pyramid, the resulting cross-section will be a rectangle with a length equal to the base of the pyramid and a width equal to the product of h and the slant height of the pyramid. Another possible 2D figure that can result from slicing a right rectangular pyramid perpendicular to its side is a trapezoid, if the slice is taken at an angle other than 90 degrees to the base of the pyramid. In this case, the resulting cross-section will have two parallel sides of different lengths and two non-parallel sides of equal length, representing the edges of the pyramid that meet at the slice.
