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An Enneacontagon is a polygon

with 90 sides and angles.

$Enneacontagon-Math Wiki.png$

v t e Regular polygons

Listed by number of sides

1–10 sides	Henagon (Monogon) Digon Equilateral triangle Square Pentagon Hexagon Heptagon Octagon Nonagon (Enneagon) Decagon

11–20 sides	Hendecagon Dodecagon Tridecagon Tetradecagon Pentadecagon (Quindecagon) Hexadecagon Heptadecagon Octadecagon Enneadecagon (Nonadecagon) Icosagon

30-90	Triacontagon Tetracontagon Pentacontagon (Quincontagon) Hexacontagon Heptacontagon Octacontagon Enneacontagon (Nonacontagon)

Others	Hectogon (Hecatontagon) Chiliagon Myriagon Megagon Apeirogon

Star polygons	Pentagram Hexagram Heptagram Octagram Enneagram Decagram Hendecagram Dodecagram

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