How to make an arc using the buffer geometry

[hofk]

I remembered that I have a corresponding construction at the showroom:

Showrooms easy to generate from data of a construction drawing or dimensional sketch - now on Github

code:
SHOWROOM/showroom/showroomBuildt.js at 3b3e76f9c059dbf328dfe901a92454d06bedf166 · hofk/SHOWROOM · GitHub
lines 502, 1811, 1904