Combinatorics › Combinatorial geometry
Counting triangles and shapes
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More in Combinatorial geometry
Convex polygons and crossingsDiagonals of a polygonDissections and cutsEquidistant points and circlesFractalsIntersections of chords and circlesLattice pointsPoint setsRegions from lines and cutsTriangles from lines and pointsTriangles in hexagonsWhich lengths make a triangle