40 + 3 x - 16 + x + 40 = 180
4 x = 180 - 40 - 40 + 16
4 x = 116
x = 29
ACB = 3*29 - 16 = 71 °
ABC = 29 + 40 = 69 °
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40 + 3 x - 16 + x + 40 = 180
4 x = 180 - 40 - 40 + 16
4 x = 116
x = 29
ACB = 3*29 - 16 = 71 °
ABC = 29 + 40 = 69 °