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static PrecisePolygon regularPolygon(DoublePt etc center, double radius, int sides, double rotation) { double angle = twoPi()/sides; rotation = degToRadian(rotation); ret new PrecisePolygon(countIteratorToList(sides, i -> addDoublePts(center, scaleDoublePt(radius, doublePt(sin(rotation+angle*i), cos(rotation+angle*i)))))); }