Mathematics

From Bwtm

This page is about Mathematics.

Contents 1 Fibonacci Numbers 2 Golden ratio 3 e (pronounced “ee”) 4 √2 (pronounced “root two”) 5 ref

Fibonacci Numbers

http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fibnat.html#golden

Golden ratio

http://en.wikipedia.org/wiki/Golden_ratio

φ (pronounced “phi”) 1.61803398875…

Equal to about 1.61803398875…, the irrational number φ is also known as the golden ratio or divine proportion. It is essential to geometry, and can be expressed as the ratio of a regular pentagon’s diagonal to the length of a side. Two numbers (say, a and b) are considered in the golden ratio if (a+b)/b = φ.

e (pronounced “ee”)

Equal to about 2.71828182846..., e was discovered by Jacob Bernoulli, who first discovered it in a formula for calculating compound interest.

√2 (pronounced “root two”)

Last and most venerable is the square root of 2 (written √2), which is equal to about 1.41421356237…Sometimes known as the Pythagorean constant, √2 is also the length of the hypotenuse of a right triangle, whose other sides both have length 1.

ref