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B = 3/2.A
= 3/2.1/2.C
= 3/4C
A + B + C = 180 derajat
1/2C + 3/4C + C = 180
2/4C + 3/4C + 4/4C = 180
9/4 C = 180
C = 180 . 4 / 9
C = 80 derajat
A = 1/2 C
A = 1/2. 80
A = 40 derajat
B = 3/2 A
B = 3/2 . 40
B = 60 derajat