As adjectives the difference between polygonal and polygonar
is that polygonal is having many angles; hence characteristic of a polygon while polygonar is (rare) polygonal.
polygonal
English
Adjective
(-)
Having many angles; hence characteristic of a polygon.
Derived terms
* Polygonal numbers , certain figurate numbers. See under figurate
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polygonar
English
Adjective
(-)
(rare) polygonal