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180 = (2x + 6 + 74)
180 = 2x + 80
2x = 100
x = 50
besar sudut B dalam segitiga = (2x + 6)
2(50) + 6 = 106
besar sudut BAC = 180 - (16 + 106)
= 180 - 122
= 58 derajat
<ABC = 180 - 74
<ABC = 106
Segitiga ABC
<BAC + < ABC + < ACB = 180 (jumlah sudut segitiga)
<BAC + 106 + 16 = 180
<BAC + 122 = 180
<BAC = 180 - 122
<BAC = 58
Jadi, besar sudut BAC adalah 58