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Mar 24, 2020 at 13:33 comment added domotorp You're right, this can also happen if the triangle has a $120^\circ$ degree angle.
Mar 24, 2020 at 8:10 comment added M. Winter I doubt the first statement. See the triakis tiling. Three triangles meet at a point, but no right angles.
Oct 26, 2019 at 4:58 history answered domotorp CC BY-SA 4.0