There are infinitely many 3-dimensional shapes with a pentagon as its base.
a pentagon is a 2 dimensional figure. It does not have a base.
A pentagon-based pyramid
pyramid
pyramid
A pentagonal prism
pentagonal pyramid
pentagon A pentagon. A 5-sided figure is called a pentagon. pentagon A five sided figure is called a pentagon
pentagonal pyramid
A five sided pyramid.
it's a pyramid with 5 sides.
A pentagon is a five sided geometrical figure; if the pentagon fits exactly inside some other geometrical figure (such as a circle) then it can be said to be inscribed in that figure.
A regular pentagon-based pyramid.