What I'd like to see in CC

[WillAdams (William Adams (Carbide 3D))]

I put a few of the more frequently needed formulae at:

2D Drawing

which w/ @heffercow 's excellent tutorial should cover things.

calculating the length of an arbitrary curve is a bit more involved — usually I’ve been able to sidestep the need to do so in my design work:

Quarter Blind Miter Box Joints

and

A different sort of box

Building from a couple of different ideas[1][2], and giving up on the perfection of void-free, and limiting tools to a reasonable number (2), I have arrived at: https://www.blockscad3d.com/community/projects/1270618 which allows one to cut out a box in 2, 3 or 4 operations: bottom (cut to size) top (cut to size) — possibly combined w/ the bottom front/back and one or both sides (repeat once for 2 operations if need be) — this will cut the joinery blind box joints and miter as well as feature…