i think it would be useful to have a system expression for solving triangles, just like we have them for lerp, qarp and cubic
<img src="http://www.1728.com/trian4.gif">
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
<img src="http://www.teacherschoice.com.au/Maths_Library/Trigonometry/solve_4.gif">
and then you find the ACOS of that decimal number.
you switch around ABC depending on what you need