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Concept

Diagonal of a Polygon

A diagonal of a polygon is a line segment connecting two non-consecutive vertices of the polygon.

It should be noted that a line segment that connects two consecutive vertices of a polygon is a side of the polygon, not a diagonal. This means that triangles have no diagonals. The number of diagonals in an

n -

sided polygon can be calculated using the following formula.

Number of Diagonals = \frac{n ( n - 3 )}{2}

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