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#Puzzle Prove that the red points are collinear.
How many proofs can you come up with ? #GeometrySnacks @edsouthall
How many proofs can you come up with ? #GeometrySnacks @edsouthall
Many solutions down there ! Here's one which is not the first one you might think of. Adding another equilateral triangle and using a 60° rotation. #MathGIF
For the colorblind folks, here's the black & white version as published in the AMS Calendar by @evelynjlamb.
