A pentagon-based pyramid
pyramid
pentagonal pyramid
pentagonal pyramid
it's a pyramid with 5 sides.
A solid figure with a pentagon as its base and triangular faces is called a pentagonal prism. In this 3D shape, the two pentagonal bases are parallel and connected by five rectangular lateral faces. However, if you specifically mean a solid with a pentagonal base and triangular faces that converge at a single point, then it is known as a pentagonal pyramid.
It is a pyramid
Triangular based pyramid
a pentagonal pyramid it has five triangular sides that all meet at a point at the top. the base is a pentagon
A five sided pyramid.
A pentagonal prism
Pyramid
a triangular base pyramid