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2/12 x 180° = 30°
<A : <B : <C
2 : 3 : 7
2x : 3x : 7x
180 = 2x + 3x +7x
180 = 12x
x = 180/12
x = 15
sudut terkecil = 2x = 2 x 15 = 30 derajat
sudut terbesar = 7x = 7 x 15 = 105 derajat