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.
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How many sides does a Decahedron Have
a decahedron a decahedron
The prefix "deca-" means ten. It has ten faces.
Measure them!
10