Heptagon
A heptagon is a seven-sided polygon. It is also sometimes called a septagon, though this usage mixes a Latin prefix sept- (derived from septua-, meaning "seven") with the Greek suffix -gon (from gonia, meaning "angle"), and is therefore not recommended.
A heptagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular heptagon.
See also
Hexagon, Octagon, Pentagon, Polygon, Regular Heptagon Explore this topic in the MathWorld classroomExplore with Wolfram|Alpha
WolframAlpha
More things to try:
Cite this as:
Weisstein, Eric W. "Heptagon." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Heptagon.html