The Triangle Angle calculator computes the interior angle (AA) of a triangle given the length of the three sides (a, b & c).
INSTRUCTIONS: Choose units and enter the following:
Triangle Angle (AA): The calculator returns the angle in degrees. However, this can be automatically converted to other angle units (e.g. radians) via the pull-down menu.
This is derived from the following equation:
`tan("AA"/2) = sqrt( ((s-b)(s-c)) / (s*(s-a)) )` where the: `s = (a + b + c)/2`