| 11. | Regular polygons are self-dual, so the rectification produces the same polygon.
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| 12. | The simplest Regular Polygon decoder is a Square with the listener in the centre.
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| 13. | A regular polygon of n sides is inscribed in a circle of radius r.
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| 14. | The inradius of a regular polygon is also called apothem.
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| 15. | All triangles are tangential, as are all regular polygons with any number of sides.
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| 16. | He also showed that Gauss's sufficient constructibility condition for regular polygons is also necessary.
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| 17. | The regular polygon perimeter seen in these orthogonal projections is called a petrie polygon.
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| 18. | The truncation, is the same as the regular polygon, 3 { 6 } 2,.
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| 19. | All of these polyhedra have regular polygons as faces.
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| 20. | One method of realizing the associahedron is as the secondary polytope of a regular polygon.
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