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
 

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