What is Polygon?, Polygon is an enclosedfigure on a plane bounded by 3 or more straight sides, Diagonals, (𝒏(𝒏−𝟑))/𝟐, 7 sides, heptagon, octagon, 8 sides, quadrilateral, 4 sides, number of vertices = number of sides, true, there is diagonals for triangle, false, pentagon, 5 sides, 5 vertices, 9 sides, 9 vertices, nonagon, 2 diagonals, quadrilateral

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