a 3D pentagon
The vertex of a 3D pentagon is 10. :)
A 3D name for a pentagon is a pentagonal prism.
No, a pentagon is 2-D.
a pentagon is a 5 sided figure so 5 (if you mean sides, not bases)
Two pentagonal bases.
A 3D pentagon could be called a pentagon prism or a dodecahedron which is a Platonic solid with 12 pentagonal faces.
A pentagonal prism will have 15 edges.
A pentagon consists of 5 bases and 5 angles.
3D pentagonal prismPRISM
It depends on what you mean by a 3-d pentagon. To most people, a 3-d pentagon is a dodecahedron - a 3d shape with 12 pentagonal faces. In that case, each of the faces, by definition, must be a pentagon! If you mean a pentahedron - a 3d shape with 5 plane faces, it could be a triangular prism or a quadrilateral based pyramid. In the first cae the bases are triangles, in the second, a quadrilateral.
Pentagon 2d shape is a pentagon 3d object is a pyramid.
An edge of a 3-d pentagon is the intersection of two of its adjacent faces.
If you are thinking of a solid with pentagonal faces, a dodecahedron, there are twelve pentagons