What is the greek symbol that represents the ratio of the length and with in a rectangle.

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I understand that there is pi, but I was provoked by a question that asked this, "I have a rectangle and if I cut a square off of it it produces the same type of rectangle. I know that the width is 1 meter but what is the length?" Please help me out and tell me the symbol and what it represents.

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It's called the golden number/ratio and is represented by the Greek letter phi :$$\phi = \frac{1+\sqrt{5}}{2}$$.