Recent content by tongtu

Sorry, I got it. The solution is now in Cut the knot. Assuming, AB=1, AE=12 and BE=5‾√2. It follows that BI=5‾√2+12=φ BH=5‾√2−12=φ−1. Problem solved! Thanks and sorry again.

Hello, dear friends of mathhelpboards; I stumbled with a striking claim in https://www.cut-the-knot.org/do_you_know/GoldenRatioInYinYang.shtml Sorry, I couldn't paste the pic. The question is if there is an algebraical or trig proof for this claim, as the angle seems to be just 45º. Then, is...