All numbers on this page are in phinary. i.e. base .
= ,+ = .
Since , +
Measuring the (perpendicular) distance from each side in turn, anti-clockwise starting with the base, the coordinates for the top of the pentagon are . The coordinates of interior points add to etc.
Since , :
.
i.e. .
The similarity of to the Fibonacci sequence rule isn’t a coincidence – the ratio of successive Fibonacci terms goes to as increases.