| 21. | This theory allowed him to formulate a sufficient condition for the constructibility of regular polygons:
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| 22. | In practice such molecules distort from planar regular polygons.
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| 23. | The regular digon { 2 } can be considered to be a degenerate regular polygon.
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| 24. | Regular polygons are the only polygons that have apothems.
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| 25. | As a zonohedron, it can be constructed with all but 30 octagons as regular polygons.
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| 26. | In two dimensions there are infinitely many regular polygons.
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| 27. | For example, all the vertices of a regular polygon of any number of sides are concyclic.
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| 28. | Thus a regular polygon is a tangential polygon.
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| 29. | For ( a ), it's true for all triangles and of course for all regular polygons.
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| 30. | In fact, every regular polygon is a circumgonal region, as is more generally every tangential polygon.
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