Is this a joke or a blondes' question? ;) I will give you a hint...7!
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A 7 sided polygon is known as an heptagon
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
It will have 12 sides
A polygon has as many angles as sides, so a polygon with 10 sides (decagon) would have 10 angles.
how many diagonals are there iin a polygon of 11 sides