The cross section of a pyramid shrinks from the shape of the base down to a point as you move along its axis from the base to the apex. The cross section of a prism is constant along its axis.
triangle
square pyramid
A triangular prism has a uniformed cross-section whereas a rectangular pyramid does not.
a triangular pyramid
It could help you remember what was inside the pyramid and how it was like. It also tells you how the builders built the tomb, or in other words, pyramid for their Pharaoh.
The cross section in a pyramid is useful because it provides a two-dimensional representation of the shape of the pyramid at a specific height or level. It allows us to see the shape, size, and proportions of the pyramid from a particular angle or perspective. Cross sections are particularly helpful in understanding and visualizing complex 3D shapes like pyramids.
The cross section of a pyramid shrinks from the shape of the base down to a point as you move along its axis from the base to the apex. The cross section of a prism is constant along its axis.
triangle
It depends on the pyramid. If it is a square based pyramid, a horizontal plane will give a square cross section, a plane inclined by a rotation parallel to one of the base axes will give a rectangular cross section whereas a plane inclined by rotation along both basal axes will result in a parallelogram cross section. Not sure how you get a parallelogram from a pentagonal or hexagonal (etc) pyramid.
triangle
The cross section is useful as it cuts across any type of shape. This is useful for architects who will be able to see the finer details of a structure.
You cannot have a 2d pyramid - whether or not it is square based. The 2d cross section will depend on the plane of the cross section.
It is a rectangle which is similar to the base.
a square
square pyramid
It can be a square, a trapezium, a quadrilateral or a triangle - depending on the inclination of the plane which defines the cross section.