360 degree swing

[mirkojpn]

hi everyone,
thank's you in advice for your help

my target is to have a game where you are going to do something like this

https://youtu.be/UJtNgtuJ-Mg

and i have find this

https://rdgamestudio.wordpress.com/2016/05/04/simple-pendulum-in-unity/

it's a good point where start, the problem is that i'm not good at math, so i need some help to understand how to accomplish it.

did you guys can help me please?