UseA valid polygon is a finite list of at least three vertices in boundary order, with the final vertex connected back to the first. The first vertex is not repeated at the end. A simple polygon also has no intersecting nonadjacent edges. Numerical routines below use finite coordinates;
type Point = (Double,Double)
type Polygon = [Point]NaN and infinite coordinates are outside this representation's intended domain. Articles by others on the same topic
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