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Polygons can be either regular or irregular and have special names:-

triangle has 3 sides

quadrilateral has 4 sides

pentagon has 5 sides

hexagon has 6 sides

heptagon has 7 sides

octagon has 8 sides

nonagon has 9 sides

decagon has 10 sides

undecagon has 11 sides

dodecagon has 12 sides and there are many more polygons with special names

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12y ago

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