A regular undecagon, also known as a regular polygon or unidecagon, is a flat shape with straight sides. It has 11 interior angles, which are equal to each other. The sum of interior angles in a regular polygon is (135^(circ)).
A decagon is a 10-sided polygon with ten vertices and ten interior angles. The total sum of the interior angles of a simple decagon is 1440°, while the sum of the interior angles of a regular decagon is 144°. The number of angles of an irregular decagon is 10 + 10 + 10 = 30.
The two interior angles of a decagon are given 200 and 250. A decagon is a closed two-dimensional polygon with ten sides and ten angles. The most basic decagon has ten equal sides and ten equal interior angles, or angles that face the inside of the polygon. Other types of decagons exist, too.
In summary, regular undecagons have 11 interior angles, with each angle equal to each other. They are closed two-dimensional polygons with ten sides and ten angles. The sum of interior angles in a regular decagon is 1440 degrees, and all sides are the same length (congruent).
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I need to make two corrections here regarding the naming of three and four sided shapes: youtu.be/xlsSL7NKQ9U Only a Greek can see the major difference in the naming theses shapes. Also, gon is the “knee” in ancient Greek. Since ancient Greeks had not invented the measure of angles, but had realized that angles do change similar to a “knee”.
Here are all the polygons from 3-10,000 sides: Triangle Quadrilateral Pentagon Hexagon Heptagon Octagon Nonagon Decagon Hendecagon* Dodecagon Tridecagon Tetradecagon Pentadecagon Hexadecagon Heptadecagon Octadecagon Enneadecagon Icosagon Triacontagon Tetracontagon Pentacontagon Hexacontagon Heptacontagon Octacontagon Enneacontagon Hectagon Chilliagon and…Myriagon
13. Tridecagon 14. Tetradecagon 15. Pentadecagon 16. Hexadecagon 17. Heptadecagon 18. Octodecagon 19. Nonadecagon/Enneadecagon 20. Icosagon 1000. Chiliagon 10000. Myragon 100000. Multigon 1000000. Megagon 1000000000. Gigagon 1000000000000. Teragon 1000000000000000. Petagon 1000000000000000000. Exagon 1000000000000000000000. Zettagon 1000000000000000000000000. Yottagon 1000000000000000000000000000. Wekagon