Q: How many edges and vertices does a decahedron have?

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A decahedron is a polyhedron with 10 faces. There are several versions of a decahedron, but none of these are regular. By definition, they all have 10 faces. There is the octagonal prism - with 24 edges and 16 vertices, the square anti-prism, with 16 edges and 8 vertices, the square cupola, with 20 edges and 12 vertices, the pentagonal bi-pyramid, with 15 edges and 7 vertices and the augmented pentagonal prism, with 19 edges and 11 vertices. See, for example, http://en.wikipedia.org/wiki/Decahedron

In geometry, a decahedron is a polyhedron with ten faces. There are 32300 topologically distinct decahedra and none are regular, so this name is ambiguous.One regular decahedron is an octagonal prism. Along with its 10 faces, it has 16 vertices and 24 edges.

They do not normally have names!

A dodecahedron has 12 equilateral pentagonal faces. From this, it has 30 edges as well as 20 vertices in its shape.

There are many possible configurations for a decahedron and they have different numbers of edges: For example: A nonagon based pyramid: 18 edges An octagonal prism : 24 edges A pentagonal dipyramid: 15 edges.

A decahedron is a shape with ten plane faces. There are 32,300 topologically distinct configurations. Some of the simpler ones are: pyramid with a nonagon base (Faces = 10, Edges = 18, Vertices = 10) prism with octagonal bases (F = 10, E = 24, V = 16) dipyramid with pentagonal base (F = 10, E = 15, V = 7).

5 vertices and 8 edges.5 vertices and 8 edges.5 vertices and 8 edges.5 vertices and 8 edges.

12 edges, 8 vertices

# of vertices: 6 # of edges: 5

Polygons have as many vertices as they have sides (edges).

A heptahedron has 7 faces. It can have 6 vertices and 11 edges, or7 vertices and 12 edges, or8 vertices and 13 edges, or9 vertices and 14 edges, or10 vertices and 15 edges.

Unfortunately a hexahedron is an ambiguous term. It means a solid object with six plane faces. But that is not enough to uniquely identify shape: it could be two triangular pyramids with their bases stuck together (a triangular dipyramid), which has 5 vertices (and 9 edges) or it could be a pentagonal pyramid, which has 6 vertices (and 10 edges) or it could be a parallelepiped (eg cube), which has 8 vertices (and 12 edges).