i think it would be useful to have a system expression for solving triangles, just like we have them for lerp, qarp and cubic
something for all sides, and something for all angles, would be best (the others arent really all that used)
youd have something like SSStri(a,b,c,X) and AAAtri(A,B,C,x)
x being A,B or C depending on what angle you want, or what side you want
the formula for SSS is
and then you find the ACOS of that decimal number.
you switch around ABC depending on what you need