Polygon' means many sided plain figure.
Poly - many
'Gon' a 2-dimensional figure.
tri = 3 (trigon , more usually 'triangle).
Tetra = 4
Penta= 5
Hexa = 6
Hepta = 7
Octa = 8
Nona = 9
Deca = 10
Centa = 100
Milla = 1000
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It is a convex polygon.
10 side polygon is called decogon
Only if you know what kind of polygon you have. If you know that you have a hexagon and one side is 1 cm, the perimeter is 6 cm. You only have to know the length of one side, since a regular polygon has equal sides. Perimeter or a regular polygon is the length of each side times the number of sides. You need to know both pieces to find the perimeter. ■
A polygon has 3 or more joined side
Apothem!