Note 502 — Chapter XI · THE LOGARITHMIC SPIRAL
Reading edition
This is the so-called Dreifachgleichschenkelige Dreieck; cf. Naber, op. infra cit. The ratio 1 : 0·618 is again not hard to find in this construction.
Reading edition
This is the so-called Dreifachgleichschenkelige Dreieck; cf. Naber, op. infra cit. The ratio 1 : 0·618 is again not hard to find in this construction.