Pyramid shape three-dimensional geometry with rectangular base, there is any amount of spikes are not valid on the same plane and in front of every page is a triangle whose vertices together that spires.
Pyramid-shaped three-dimensional geometry is a polygon with any base. A spire that is up on the same plane with the base. All pages and a triangle with vertices together at the apex.
The pyramid is a three-dimensional geometric shape as the base polygon with any A spire at the same plane with this not home base. And every page is a triangle with vertices together at cusps.