# Triangles

Winnies triangle
Pascals triangle
Sierpinski triangle
Eulers triangle
Fibonacci triangle

# Misc

333

## Constants

PI
e
Divine / golden ratio
Plastic number - Unique real solution of the cubic equation

## Facts

Any whole number can be written as the sum of at most three triangle numbers
Every square number is also the sum of two consecutive triangle numbers

## Site

Links to useful resources
Watch Joseph many colours video by John Kostik