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3:2:1 = 3x:2x:x
sudut a + sudut b + sudut c = 180°
3x + 2x + x = 180
6x = 180
x = 180:6
x = 30
3x = 3(30)= 90°
2x = 2(30)= 60°
x = 30° merupakan sudut terkecil