35.
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A diagonal line of a polygon is a line that joins any two vertices not already joined by a side. A polygon with n sides has n(n-3)/2 diagonals → a decagon has 10(10-3)/2 = 10 × 7 ÷ 2 = 35 diagonals
35
It depends if the polygon is convex or concave but if it is a regular polygon it would have 560
It will have 35 sides and can be described as a 35-agon
A 35-sided polygon.