Best free/cheap box design software

Most (all?) loudspeaker enclosure calculation programs allow to set simple internal volumes and maybe one main dimension only (I like hornresp). You would need a cad software or pen and paper or calculator and the respective formula to calculate the volume of a triangular box.
If you need a simulation of complex enclosure plus port you would gave to use a fem- simulator (akabak, abec, comsol, ... no clue if there are free versions).

Surface of a triangle, by the way:
base * height / 2
 
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