Heptagon

A heptagon, also referred to as a septagon or 7-gon is a shape with 7 sides and 7 corners.

Regular heptagon

All sides of a regular heptagon are the same length. Each corner is about 128.6°. All corners added together are equal to 900°.

The amount of space a regular heptagon takes up is

A={\frac {7}{4}}a^{2}\cot {\frac {\pi }{7}}\simeq 3.634a^{2}.

a is the length of one of its sides.

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v t e 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