OptionalradiusDistance from the centre to the rim; defaults to 1.
OptionalsegmentsNumber of rim vertices, i.e. of triangles in the fan. Defaults to 32, which keeps a unit circle's silhouette error under about half a percent of its radius — smooth enough for MVP-tier 2D shapes at any reasonable on-screen size. Must be a finite integer ≥ 3.
Options of circleGeometry2D.