I was just playing around with GeoGebra, then I tried to represent four sets $A, B, C, D$ using triangles. It seems correct to me, but I want your confirmation.
If not correct, I hope you bother to state the reason.
2026-04-09 14:59:26.1775746766
Is this a correct Venn Diagram for 4 sets? (Not circles)
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As pointed out in the Comments, you're missing various regions. Here's one with 4 triangles that does work. I tried to use 1 right angled (blue), 1 isosceles (red), 1 equilateral (green), and 1 scalene (black) triangle, so you can use this Venn diagram to classify various triangles. :)