Issue with trigonometry.scad opp_adj_to_ang

[joshuajmlee]

I maybe have a slightly older version (maybe a week or so old?) OpenSCAD version 2026.01.03 (git 6cad20bd)

The issue I'm having is that I'm trying to use opp_adj_to_ang(x,y) to calculate and angle of a right triangle using the opposite length and adjacent length.

Manually calculating it, I get :
atan=opp / adj = 38.65 / 31.90 ≈ 1.2116
atan(1.2116) ≈ 50.46°

Using OpenSCAD, I get:

laptop_width = 21.9;
ang = opp_adj_to_ang(38.65,laptop_width);
ang = 60.4631

I'm guessing I'm doing something wrong, but I'm not sure what.

[revarbat]

Well, first off, 31.9 is NOT equal to 21.9.

[joshuajmlee]

You're a genius! I've been staring at this for almost a month and kept changing different pieces to get it to work (before I found BOSL2) and at one point I had a function that added the width of the bracket (10mm) to the width of the laptop (21.9mm).

Thank you!!!!!