Magical Triangle - Think Outside The Box!

Many people requested this one. It was asked to 9th grade students in India who had only learned geometry, so you are supposed to solve it without using trigonometry. I thank Anand Gautam for discovering the incredible solution! Polish translation credit: Tłumaczenie: Przemyslav Znajdź mnie tutaj: ła-wieś-pośrodku-niczego/ You can also solve the problem with trigonometry. This post does so for the 2nd part of the question: