Using the supplementary angles theorem, it is found that the measure of the second angle is of m<2 = 45º.
Two angles are supplementary when the sum of their measures is of 180º.
The Alabama state flag has two lines opposite by the same vertex, hence two angles that are sided are supplementary, hence:
m<1 + m<2 = 180º.
135º + m<2 = 180º.
m<2 = 45º.
The measure of the second angle is of m<2 = 45º.
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