Create panel > Geometry button > Standard Primitives > Object Type rollout > Pyramid button
Create menu > Standard Primitives > Pyramid
Tab panels > Objects tab > Pyramid Object
The Pyramid primitive has a square or rectangular base and triangular sides.

Examples of pyramids
To create a Pyramid:
On the Create menu choose Standard Primitives > Pyramid.
Choose a creation method, either Base/Apex or Center.
Note: Hold the CTRL key while using either creation method to constrain the base to a square.
In any viewport, drag to define the base of the pyramid. If you're using Base/Apex, define the opposite corners of the base, moving the mouse horizontally or vertically to define the width and depth of the base. If you're using Center, drag from the center of the base.
Click, and then move the mouse to define the Height.
Click to complete the pyramid.
Base/Apex—Creates the pyramid base from one corner to the diagonally opposite corner.
Center—Creates the pyramid base from the center out.

Width, Depth and Height—Sets the dimension of the corresponding side of the pyramid.
Width, Depth and Height Segs—Sets the number of segments to the corresponding sides of the pyramid.
Generate Mapping Coordinates—Sets up required coordinates for applying mapped materials to the pyramid. Default=off.
Note: If a visible viewport is set to a non-wireframe or non-bounding-box display, Generate Mapping Coordinates is on for all primitives to which you apply a material containing a map with Show Map In Viewport on. If all viewports are set to wireframe or bounding box, the software turns on Generate Mapping Coordinates for primitives containing mapped materials at render time.
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