The golden ratio describes geometry in which squares whose edges are sized using numbers from the Fibonacci sequence. The ratio of the sum of the larger square and the next smaller square to edge of the larger square is equal to the sum of the edge of the larger square and the edge of the smaller square. If A is the length of the edge of the larger square and B is the length of the smaller square, (A + B)/A = A/B ~ 1.618.
The Greek letter phi written in digits from the golden ratio. PHI is an irrational number like PI with a value of 1.618...
The golden ratio can be see in the way that leaves grow in plants.
he ratio of the radius of the circle to the length of the square measuring the height of the man is the golden mean. Da Vinci was relating Man to Nature.
The pearl nautilus shell is an example of how we see the Fibonacci spiral in nature.
The golden ratio can be expressed linearly.
The Great Pyramid and the Parthenon both use PHI in their architectural design