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a + b + c = 180
1a + 2a + 3a = 180
6a = 180
a = 30 derajat
sudut terbesar = 30derajat x 3 = 90 derajat
sudut segitiga = 180⁰
180 : 6 = 30
30 x1 = 30
30x2 = 60
30x3 = 90