A = B = C =
a = b = c =

Capital-letter variable names correspond to angle measures, opposite from each side length named by the lowercase-letter counterpart.  All angle measure inputs are in degrees (pre-multiplied by 180:pi).  The side lengths a, b and c are in arbitrary units and do not at all affect the triangle size or drawing in any way, other than to help compute any unknown angle measures.

Quadrant II (90 to 180 degrees) Quadrant I (0 to 90 degrees)
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I also maintain a separate research project to derive many exact trigonometric ratios so that many of these answers can be expressed in exact form.

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