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Suppose you have a rectangle with long side (length) a and short side (breadth) b. Put it next to a square of sides a. This will make a rectangle with length a+b and breadth b.


The rectabgles have sides in the Golden Ratio if

(a + b)/a = a/b = phi.


If you substitute b = 1 in the above ratio, you get phi as the root of a^2 - a - 1 = 0

so that phi = [1 +/- sqrt(5)]/2 = 1.6180, approx, {and -0.6180}.


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