Since angle measures are often denoted by Greek letters, I will assume
that you mean the angle between the two lines indicated by the capital letter pairs.
a between FB and FE
b between GC and GD
q between CA and CH
[Note: Angle CAH is a right (90°) angle though the perspective drawing below
might fool you]
g between BE and ED
[Note that the two diagonals of rectangle ABCD are equal, so BD=AC=20.61552813]
j between FA and FC
This angle is equal to one of the above angles calculated above. Can
you tell which one it is?
Edwin
