regular pyramid造句

This genus markedly differs from " Echinodorus " by a typical paniculate inflorescence shaped as a regular pyramid.
A "'regular pyramid "'has a regular polygon base and is usually implied to be a " right pyramid ".
A right regular pyramid is one which has a regular polygon as its base and whose apex is " above " the center of the base, so that the apex, the center of the base and any other vertex form a right triangle.
It's difficult to find regular pyramid in a sentence. 用regular pyramid造句挺难的