No such thing as a 'hepagon'. I think you mean 'HEPTAGON'. Note the spelling.
A heptagon is a seven(7) sided 2-dimensional figure.
From their Latin roots, the names of polygons are : -
3 ' Trigon (Triangle).
4 ' Tetragon ( Quadrilateral)
5 ' Pentagon
6 ' Hexagon
7' Heptagon ( as given)
8 ' Octagon
9 ' Nonagon
10 ' Decagon
100 ' Centagon
1000 ' Millagon.
'--gon' is also Latin , for '2 dimensional figure.
So learn some Latin. Science and Maths use a lot of words from these ancient languages.
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Heptagons have seven sides.
You may be thinking of a heptagon. It has seven sides and seven angles.
An heptagon has 7 interior angles that add up to 900 degrees
A 11 sided shape is called a hendecagon.
The word is heptagon. A heptagon has 7 sides and 7 corners. If you join corners by straight lines from one corner to another corner you will find 5 triangles, but if you join all corners to a point in the centre you will find 7 triangles. The Heptathlon in athletics is a contest in which the participants must compete in 7 different athletic forms of athletics.