Triangle Calculator

Give any three measurements that fix a triangle and this returns the whole thing: all three sides, all three angles, the area, the perimeter, the three heights and the circumradius and inradius. Pick the case you have rather than working out which rule it needs, whether that is three sides, two sides with the angle between them, two angles with a side, or two sides with an angle that is not between them. That last case, SSA, is the one that can describe two triangles, one or none, and it is handled honestly: when there are two you get both, and when there is none you are told which measurement fell short. The right angle case has its own page, and so do the sine and cosine rules taken one line at a time.