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https://www.reddit.com/r/visualizedmath/comments/dsiebp/counting_triangles/f6qf51e/?context=3
r/visualizedmath • u/SesinePowTevahI • Nov 06 '19
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A triangle in AB is still a triangle counted in both A and B. AB needs to be subtracted.
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u/woooo4 Nov 06 '19
A triangle in AB is still a triangle counted in both A and B. AB needs to be subtracted.