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A polygon with n sides has n*(n-3)/2 diagonals (not diagnols!).So, an octagon has 8*5/2 = 20 of them.
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A polygon must have at least three sides.
Polygon has three or more sides.
There is no such shape. And unfortunately the word is too much like two terms to determine which of them you mean.If the polygon has n sides (n>3), then it has n*(n-3)/2 diagonals.
It can have any number of sides greater than or equal to three.
Three or more
A polygon can have any number of three or more sides. It is a generic name for a many-sided figure, and does not specify a particular number of sides. A polygon is a shape constructed with straight lines and no gaps between each side.
It has: 0.5*(100^2-(3*100)) = 4850 diagonals
The number of sides a polygon has depends on the polygon. A triangle has three sides (tri=3). A rectangle (quadrilateral) has four sides (quad=4). A regular polygon can have any greater number of sides, without limit.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
A polygon can have any amount of sides - three or more, that is. There is a lovely Wikipedia page on polygons, it can help with any other polygon questions you may have: http://en.wikipedia.org/wiki/Polygon