Pentagon is 5 sided.
From Latin the names ore
Tri = 3 ( As trigon / triangle)
Quad = 4
Penta = 5
Hexa = 6
Hepta = 7
Octa = 8
Nona = 9
Decs = 10
Centa = 100 ( AS centagon - 100sides).
Kilo = 1000
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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
10 sides
4 sides.