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5 diagonals * * * * * That is not correct since two of these would be lines joining the vertex to adjacent vertices (one on either side). These are sides of the polygon, not diagonals. The number of diagonals from any vertex of a polygon with n sides is n-3.
the same as a regular quadrilateral, 4
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six
Five. (Even a non-regular pentagon has 5 diagonals).