The main idea : if there is straight line, the curved line equals straight line x &.
The rest is simple algebra.
What are you talking about? What is "Phew"?
A new version of C/D whose value equals 3.17157.
Maybe there's a bit of background that is missing? Is this a substitute for Pi? What does it mean? How can C/D change?
Try 5° and r=25 m. The pi's cord and pi's arc relatively IDENTICAL.
Pi is like a faith without fixed calculation. Instalasi in calculator as predetermined constant. Not different from solar sistem by Copernicus' imagination.
Phew comes up with fixed calculation taken from real circle's numbers.
Such as sin45, 1- cos45, 2sin(45:2).
After calculation, the golden ratio of a circle and straight line is always the same 0.7928932:1 (r=1).
Here they are:
[sin45 + (1-cos45)²] : 1
[(sin45)² + (1-cos45)] : 1
tan(45) + [2sin(45:2)]² : 2
All meet 0.7928932 ratio AKA Phew/4