What is the Golden Ratio?

16:9

Step-by-step explanation:

If a rectangle made with a 16:9 ratio is cut into another rectangle and a perfect square, the rectangle will also have a 16:9 ratio. This could be done forever, leading into a sequence of numbers that adds from its previous number. i. e. 1, 1, 2, 3, 5, 8, 13, 21, etc

The golden ratio is the next number equals the sum of the last to example listed