A pentagon for a base, five triangles reaching up to a point on top.
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"Pentagonal" is an adjective, not a noun so a pentagonal cannot exist. You can have a pentagonal plane shape, a pentagonal pyramid,a pentagonal dipyramid,a pentagonal prism and so on and each of them will look different.
A pentagonal pyramid is one possible answer.A pentagonal pyramid is one possible answer.A pentagonal pyramid is one possible answer.A pentagonal pyramid is one possible answer.
a pentagonal pyramid is also known as a pentahedron
A pentagonal pyramid has 10 edges.
tat the pentagonal pyramid has a point at the top and the pentagonal prism is flat with out a point.