A Golden Ratio is a special number.
It is found by dividing a line into two parts so that the longer part divided by the smaller part is also equal to the whole length divided by the longer part.
Golden Ratio is often symbolised by using letter phi.
The value of phi is 1.618 Golden Ratio is also called as a golden mean, golden section or a divine proportion.
Historically, the number can be seen in the architecture of many ancient creations like the great pyramids and the Parthenon.
Please refer above image for the figure and formula to find out the Golden ratio of any rectangular shape body.