Absolutely no idea how it works. How do you control the position of points without inputting coordinates? For example, how does one make an image similar to th

Absolutely no idea how it works. How do you control the position of points without inputting coordinates? For example, how does one make an image similar to this? https://math.stackexchange.com/questions/1109967/problem-involving-2-right-triangles-trigonometry https://math.stackexchange.com/questions/1109967/problem-inv...