find the number of diagonals of a decagon from one vertex
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The number of diagonals in a polygonthat can be drawn from any vertex in apolygon is three less than the numberof sides. To find the total number of diagonals in a polygon, multiply thenumber of diagonals per vertex (n - 3) by the number of vertices, n, and divide by 2 (otherwise each diagonal is counted twice).
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