Let the two congruent square side be 1 unit.
a = √(2) units
a is a diagonal of one of the congruent squares.
tanb = 1/(√(2)+1)
b = 22.5°
c = 90-b
c = 67.5°
d = ½(180-135)
d = ½(45)
d = 22.5°
e = 180-67.5
e = 112.5
f = 180-112.5-22.5
f = 45°
It implies, the required angle alpha is;
180-45
= 135°
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