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.
A triangular prism has a uniformed cross-section whereas a rectangular pyramid does not.
A cylinder has a circular cross-section whereas a cuboid has a quadrilateral cross-section.
triangle
It'll help you divide the pyramid into sections that are easy for you to study from
square pyramid
A triangular prism has a uniformed cross-section whereas a rectangular pyramid does not.
difference between cross section and block daigram
I assume you mean between prism and pyramid. I suggest you look at some picture of prisms and pyramids, to get it perfectly clear. In any case, a prism has the same horizontal cross section from the bottom the top. On the other hand, the lines of a pyramid get together towards the top, to a point. If you take a horizontal cross section, at the base it will be larger, but the closer you get to the top, the smaller such a cross section will be.
A cylinder has a circular cross-section whereas a cuboid has a quadrilateral cross-section.
A cylinder has a circular cross section, a rectangular prism has a rectangular cross section.
A cylinder has a circular cross section, a square prism has a square cross section.
triangle
Yes, a square can be a cross-section of a pyramid, depending on how the cross-section is taken. If the cut is made parallel to the base of the pyramid and at a height where the sides are still straight and converge, the resulting section can be a square. However, this is only possible if the pyramid's base is also a square and the cut is made at the right height.
Yes, a trapezoid can be a cross section of a rectangular pyramid. When a plane intersects the pyramid parallel to one of its bases, the resulting cross section will be a trapezoid if the plane cuts through the sides of the pyramid. The top base of the trapezoid will be shorter than the bottom base due to the tapering shape of the pyramid.
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
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.