a = 180-60
a = 120°
b = 180-120-45
b = 15°
(1/sin15) = (c/sin45)
c = 2.73205080757 units.
sin60 = d/c
d = 2.73205080757sin60
d = 2.36602540378 units.
cos60 = e/c
e = 2.73205080757cos60
e = 1.36602540378 units.ñ
f = 2-e
f = 2-1.36602540378
f = 0.63397459622 units.
Therefore, the required angle is, let it be g.
tang = d/f
g = atan(2.36602540378/0.63397459622)
g = 75°
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