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Heptagon - Wikipedia
 
In geometry, a heptagon is a seven-sided polygon or 7-gon. The heptagon is sometimes referred to as the septagon, using septa- (an elision of septua-), a Latin -derived numerical prefix, rather than hepta-, a Greek -derived numerical prefix (both are cognate), together with the suffix -gon for Greek: γωνἰα, romanized: gonía, meaning angle. 
  
Heptagon – Definition, Shape, Properties, Formulas
 
Heptagon Definition A heptagon is a polygon with seven sides and seven angles. The term ‘heptagon’ is derived from the Greek words ‘hepta’ meaning seven and ‘gon’ meaning sides. A heptagon is also known as 7-gon or septagon (‘septa’ means seven in Latin). 
  
Heptagon Definition, Properties, Types, Formula, Example
 
Learn about the two-dimensional shape heptagon and its properties. Learn about types of heptagons and how to find the perimeter of a heptagon. 
  
Heptagon - Math.net
 
Heptagons are present in real life. Two real-life heptagon examples include the fifty pence and twenty pence coins in the UK. The figure below shows a few examples of the shapes that a heptagon can take on. Heptagons are classified as regular or irregular and concave or convex. 
  
Heptagon -- from Wolfram MathWorld
 
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. 
  
Septagon vs. Heptagon: What's the Difference?
 
A regular septagon or heptagon has all its sides and angles equal, whereas an irregular one does not have equal sides and angles. Regardless of the nomenclature, the geometric principles applicable to a septagon are equally applicable to a heptagon. 
  
Mastering Heptagons – A Beginner’s Guide
 
There are two main types of heptagons: regular and irregular. A regular heptagon has all sides and angles equal. It is both cyclic (all corners lie on a single circle, known as the circumcircle) and equilateral (all sides have the same length). 
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