Regular pyramid a pyramid is said to be a regular pyramid if its base is a regular figure.

Triangular pyramid a pyramid is called a triangular pyramid if its base is a triangle.

Triangular pyramid a pyramid is called a triangular pyramid if its base is a triangle.

Quadrilateral pyramid a pyramid is called a quadrilateral pyramid if its base is a quadrilateral.

Quadrilateral pyramid a pyramid is called a quadrilateral pyramid if its base is a quadrilateral.

Right pyramid a pyramid is said to right pyramid if the perpendicular dropped from the vertex on the base meets the base at its central point.

Right pyramid a pyramid is said to right pyramid if the perpendicular dropped from the vertex on the base meets the base at its central point i.e. the centre of the inscribed or circumscribed circle. In other words the vertex of the pyramid lies on the perpendicular to the base drawn through its centre. Otherwise the pyramid is called an oblique prism.

The pyramid of number is based on

A pyramid is solid figure, the base of which is :

Pyramid a pyramid is a solid whose base is a plane rectilinear figure and whose side-faces are triangles having a common vertex outside the plane of the base.