Hectogon

A hectogon or hectagon is a shape with 100 sides and 100 corners.

Regular hectogon

All sides of a regular hectogon are the same length. Each corner is 176.4°. All corners added together equals 17640°.

The area of a regular hectogon of side length a is given by:

A=25a^{2}\cot {\frac {\pi }{100}}\simeq 795.513a^{2}

Polygons
Special cases, including regular polygons with their own names, in parentheses List of polygons by number of sides
1–10 sides	Henagon Digon Triangle Quadrilateral Pentagon Hexagon Heptagon Octagon Nonagon Decagon
11–20 sides	Hendecagon Dodecagon Tridecagon Tetradecagon Pentadecagon Hexadecagon Heptadecagon Octadecagon Enneadecagon Icosagon
21–100 sides (selected)	Icosikaitetragon (24) Triacontagon (30) Triacontadigon (32) Tetracontagon (40) Pentacontagon (50) Hexacontagon (60) Heptacontagon (70) Octacontagon (80) Enneacontagon (90) Hectogon (100)
>100 sides	257-gon Chiliagon (1,000) Myriagon (10,000) 65537-gon Apeirogon (∞)
Star polygons (5–12 sides)	Pentagram Hexagram Heptagram Octagram Enneagram Decagram Hendecagram Dodecagram
Triangles	Equilateral triangle Isosceles triangle Scalene triangle Right triangle Acute and obtuse triangles
Quadrilaterals	Square Rectangle Rhombus Parallelogram Trapezoid Kite Antiparallelogram