Those are bad answers. Really bad.

What part of them were bad? And where is your contribution?

Asking Gemini spit out this:

https://godbolt.org/z/fzfnY6r39 - using a brush

https://godbolt.org/z/hdKe1b71P - using triangles for miter support.

It's not my responsibility to educate you. Especially if you won't take the time yourself to understand the problem.

I suggest you read through the sibling comments.