Pyramid is a solid having any plane figure for its base and triangles for its sides. A pyramid is described by the shape of its base. The number of triangular faces depends on the number of sides of the base. For instance, a pyramid with a rectangular base has four triangular faces, whereas a pyramid with a hexagonal face is made up of six triangular faces, and so on.
A rectangular pyramid is a three -dimension figure with four faces that are triangles and base that is a rectangle.

A pyramid is a solid figure with a polygonal base and triangular faces that meet at a common point. A pyramid is described by the shape of its base. A pyramid having rectangular base is called as a rectangular pyramid. Rectangular pyramid have four triangles meet at a common point, called apex, which come off of a common rectangular base.

Rectangular Pyramid

l, b, be the length and width of the rectangular base of the rectangular pyramid.

$s_1$ and $s_2$ be the slant lengths of the triangles with base length and width respectively.

h is the height of the pyramid.