Question

How would you find the width of a golden rectangle if your givin the length?

Answer 1

A golden rectangle is a rectangle whose length and width follow the golden ratio (about 1:1.618).

Given the length, you would divide by 1.618 to find the width.

Edit: The exact value is $\frac{ 1+\sqrt{5} }{2}$, but 1.618 should suffice.