these are used as a math tools in https://joonk2.github.io almost taken from https://angeloyeo.github.io/
if you want to use then follow down below in sequence

# on your cmd or vscode terminal whatever.
git clone https://github.com/joonk2/math.git

1. in each folders, exclude gif file and put all of'em together and click index.html
2. then you'll see controler with simulations or automatic playing gif