An Icosahedron has 20 triangular sides.
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It is icosahedral 20
no because they don't have the same sides or vertices as the regular ones which are tetrahedral, octahedral, dodecahedral, icosahedral, they are all regular polydrons but not decahedral
10 sides.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
heptagons have 7 sides