|a + b:||12.9443757726|
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The online Golden Rectangle Calculator is used to calculate the golden rectangle based on the length of a single side.
In geometry, a golden rectangle is one whose side lengths are in the golden ratio (approximately 1:1.618).
A golden rectangle (interior golden rectangle) with longer side a and shorter side b, when placed adjacent to a square with sides of length a, will result in a new golden rectangle (outer golden rectangle) with longer side a + b and shorter side a (see image above).