Four equilateral triangles. Prove that the red quadrilateral is a parallelogram.
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Solution

Four equilateral triangles. Prove that the red quadrilateral is a parallelogram.
Scroll down for a solution to this problem.
Four equilateral triangles. Prove that the red quadrilateral is a parallelogram. https://t.co/pjLWoWAUIR pic.twitter.com/E8tR3GepZ3
— Mirangu (@Mirangu1) March 23, 2023