Poligon
Poligon telah dikenal sejak zaman dahulu. Poligon reguler diketahui orang sejak zaman Yunani kuno, dan pentagram, poligon beraturan yang tidak cembung (poligon bintang), muncul pada vas bunga Aristophonus, Caere, tertanggal abad-ke 7 Sebelum Masehi. Non-convex polygons in general were not systematically studied until the 14th century by Thomas Bradwardine.