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12x = 180
x = 15
besar sudut terkecil
= 2x = 2(15) = 30derajat
2x + 3x + 7x = 180 derajat
12 x = 180 derajat
x = 15
dari perbandingan sudut terkecil yaitu 2 jadi, 2(15) = 30 derajat