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Heptagon - Wikipedia
In geometry, a heptagon or septagon is a seven-sided polygon or 7-gon. The heptagon is sometimes referred to as the septagon, using "sept-" (an elision of septua-, a Latin -derived numerical prefix, rather than hepta-, a Greek -derived numerical prefix; both are cognate) together with the Greek suffix "-agon" meaning angle.

Heptagon – Definition, Shape, Properties, Formulas - Math Monks
Depending on the sides, angles, and vertices, heptagon shapes are classified into the following types: Regular Heptagon: Has seven sides of equal length and seven interior angles each measuring 128.571° and exterior angles of 51.43° each. The sides of a regular heptagon meet each other at an angle of 5π/7 radians or [128(4/7) degrees].

Heptagon - Definition, Properties, Types, Formula and Example
In this article, let’s discuss the seven-sided polygon called “Heptagon” with proper definition, shape, sides, properties along with its formula in detail. Also, read: Quadrilaterals. A heptagon is a polygon with 7 sides and 7 angles. Sometimes the heptagon is also known as “septagon”.

Heptagon Definition, Properties, Types, Formula, Example - SplashLearn
What is a Heptagon? A heptagon is a two-dimensional shape with 7 sides and 7 angles. It belongs to the class of polygons in two-dimensional geometry. Polygons are closed shapes made up of straight lines and no curves. “Hepta” means seven and “gonia” means angle in the Greek language.

Heptagon | Definition, Types, Properties, Formula, Examples
A heptagon is a seven-sided polygon, a two-dimensional closed figure with seven sides and seven angles. It is distinguished by its unique structure, which includes different parts that affect its geometry. The important parts which make a polygon a "heptagon" are as follows:

Heptagon | Definition, Sides, Angles (Regular & Irregular) - Tutors
A heptagon is a 7-sided polygon with 7 interior angles that sum to 900°. The name heptagon derives from the Greek words hepta- for seven and gon- for sides. A heptagon is also called a 7-gon or septagon ( septa- is Latin for seven).

Heptagon - Math.net
A heptagon is defined as a 7-sided, closed, two-dimensional shape. Heptagons are present in real life. Two real-life heptagon examples include the fifty pence and twenty pence coins in the UK.

Heptagon – Definition, Types, Properties, Formula, Examples
A heptagon, as the name suggests, is a polygon with seven sides and seven angles. These seven sides can take various forms and lengths, making heptagons a diverse family of geometric shapes. The term “heptagon” is derived from the Greek words “hepta,” meaning seven, and “gonia,” meaning angle.

Heptagon - Definition, Types, Properties, Formula, Examples - Cuemath
Heptagon is a two-dimensional shape with seven angles, seven vertices, and seven edges. This seven-sided polygon “heptagon” is made up of two words ‘Hepta’ and ‘Gonia’, which means seven angles. Another name given to it is septagon or 7-gon. A heptagon has fourteen diagonals.

Shape of Heptagon: Learn Definition, Facts and Examples - Vedantu
What is a Heptagon? A heptagon can be defined as a polygon that has seven sides, seven angles, and seven edges. The sum of all the angles of a heptagon is 900°. Fourteen diagonals can be drawn in a heptagon. Sometimes heptagon is also known as septagon.