Describe the two-dimensional figure that results from making a perpendicular slice to a right rectangular pyramid that goes from the base through the apex

The two-dimensional figure that results from making a perpendicular slice to a right rectangular pyramid that goes from the base through the apex would be a triangle. The resulting triangle would have the same base as the base of the pyramid, and the vertices of the triangle would be the apex of the pyramid and the two points where the slice intersects the base of the pyramid. The shape of the triangle would depend on the angle at which the slice is made.