NameAlternate namesSidesInternal Angles
(Regular Polygons Only)HenagonMonogon1Digon2TriangleTrigon360° / Total 180°QuadrilateralTetragon490° / Total 360° Pentagon5108°Hexagon6120°HeptagonSeptagon7128.571°Octagon8135°EnneagonNonagon9140°Decagon10144°HendecagonUndecagon11147.273°Dodecagon12150°TridecagonTriskaidecagon13152.308°TetradecagonTetrakaidecagon14154.286°PentadecagonQuindecagon
Pentakaidecagon15156°HexadecagonHexakaidecagon16157.5°HeptadecagonHeptakaidecagon17158.824°OctadecagonOctakaidecagon18160°EnneadecagonEnneakaidecagon
Nonadecagon19161.053°Icosagon20162°Icosihenagon21162.857°Triacontagon30168°Tetracontagon40171°Pentacontagon50172.8°Hexacontagon60174°Heptacontagon70174.857°Octacontagon80175.5°Enneacontagon90176°HectagonHectogon100176.4°Chiliagon1,000179.64°Myriagon10,000179.964°Decemyriagon100,000179.996°HecatommyriagonHekatommyriagon
Megagon1,000,000~180°Googolgon10100~180°n-gonn(n-2) x 180° / n
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Regular polygons.
Regular polygons with 3, 4 or 6 sides.
I don't. Think they are.
Regular polygons are those polygons that are bothequilateral (all sides congruent) and equilateral (all interior angles congruent).
All pentagons are regular or irregular 5 sided polygons