What is the formula for calculating the distance between two points of an equilateral triangle with a known "radius"? I have an equilateral triangle with each point being a known distance of N units from the center of the triangle.
What formula would I need to use to determine the length of any side of the triangle?

Hint
let $L$ be the length of the triangle sides.
then
$$L^2=N^2+N^2-2N.N.\cos(\frac{2\pi}{3})$$
and
$$L=2N\sin(\frac{\pi}{3})=N\sqrt{3}$$
