We extend the cross ratio from four collinear points to four concurrent lines, and introduce the special cases of harmonic ranges and harmonic pencils.
This video is part of the WildTrig series, which introduces Rational Trigonometry and applies it to many different aspects of geometry.
wala
storm8901 1 year ago
Is spread (a,c) the same as angle between a and c?
alexmineh 1 year ago
Well done, again.
peterhi503 2 years ago
Thanks.
786HKHM 2 years ago