Let the two equal lengths be 1 unit each.
a = 180-45
a = 135°
b = 180-135-15
b = 30°
(1/sin15) = (c/sin30)
c = 1.9318516526 units.
d² = 1.9318516526²+1²-2*1.9318516526cos45
d = 1.4142135624 units.
Therefore, the required angle x is;
(1.4142135624/sin45) = (1/sinx)
x = 30°
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