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C + 2B + B = 180 derajat
C + 3B = 180 Derajat
C = 90 Derajat (karena segitiga siku siku)
90 + 3B = 180
3B = 180 - 90
3B = 90
B = 90/3
= 30
A = 2B
A = 30 × 2 = 60
Jadi , A = 60 .B = 30 .C = 90