19-GoldenRectangle

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You may drag any of the red points, and the construction will adjust accordingly.

** Explanation of the construction: **
The Golden Rectangle has sides whose lengths are in the Golden Ratio, (1+sqrt(5))/2.
The Pythagorean Theorem gives the length of the diagonal as sqrt(5)/2, and AM is 1/2,
so the sum of AM and MF is the Golden Ratio, AC. Then it just remains to complete
the rectangle.

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