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How to make a 75 degree angle with a rectangular piece of paper
1. Fold a square first
2. Each point of a 1 / 2 square (rectangle) folded by a square is ABCD, and ab is the long side
According to a right triangle, if a right side is equal to half of the hypotenuse, then the angle of this side is 30 degrees
4. So fold the complementary angle of 30 degrees, so one angle is 75 degrees (180-30 = 150150 / 2 = 75)
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