Pyramid

Pyramid 

1. Choose Draw, Surfaces, 3D Surfaces...
2. Pick the pyramid from the dialog menu.
or
3. Type AI_PYRAMID at the command prompt.
Command: ai_pyramid
Specify first corner point for base of pyramid: pick
Specify second corner point for base of pyramid:
<Ortho on> 4
Specify third corner point for base of pyramid: 4
Specify fourth corner point for base of pyramid or
[Tetrahedron]: 4
Specify apex point of tetrahedron or [Top]: .xy
of pick
(need Z): 4