The author David H. Ahl in his book 'The TRS-80 Model 100 and NEC PC-8201 Idea Book, page 60.

By the way, Pi * sqrt(Phi)=4

BeerDrinker (talk)03:26, 18 April 2010

You have to use 2 decimal place accuracy for Phi=1.62 and Pi=22/7

BeerDrinker (talk)03:35, 18 April 2010