3D triangle generator creates right triangles. It lets you specify the top angle, the height, the depth, the proportion of the top depth to bottom depth, allows centering, and inverting.

It uses some good 'ole high school level math (Pythagorean Theorem & Sohcahtoa) piped into a dynamic polyhedron module I created for super fast rendering as well. No union() or difference() methods at all! :D

I created this to be able to easily create support structures in my openSCAD models for tall thin walls. By using a low upper angle and tall height it will help "brace" the wall with limited extra material if placed properly... I've uploaded the "almost" (needs testing) finished STL of the object I created the support triangles module for to give an example of how I used it :)

You can use customizer if you just want to create a stand-alone triangle STL with the dimensions you choose...

Or you can download the supportTriangle.scad file and place it into the default location for openSCAD libraries on your PC, or just place it into the same folder as the model you want to use it for.

Then in your model you just type:
include