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It is decided by the number of angles or sides

3: triangle

4: quadrangle

5: pentagon

6: Hexagon

7: Septagon

8: octagon

9: nonagon

10: Decagon11

Undecagon, Hendecagon13

Tridecagon, Triskaidecagon14

Tetradecagon, Tetrakaidecagon15

Pentadecagon, Pentakaidecagon16

Hexadecagon, Hexakaidecagon17

Heptadecagon, Heptakaidecagon18

Octadecagon, Octakaidecagon19

Enneadecagon, Enneakaidecagon20

Icosagon

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14y ago

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