B = 180 - 120
B = 60
C + 120 = 180 （ linear pair ）
C = 180 - 120
C = 60
A + B + C = 180 （ angle sum property ）
A + 60 + 60 = 180
A = 150 - 120 = 60
Written on Aug. 28, 2021, 10:31 p.m.
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（3rd ka answer ）B + 120 = 180 （ linear pair ）
B = 180 - 120
B = 60
C + 120 = 180 （ linear pair ）
C = 180 - 120
C = 60
A + B + C = 180 （ angle sum property ）
A + 60 + 60 = 180
A = 150 - 120 = 60
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