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sudut B = 3x-1
Jawab:
Pada suatu segitiga jumlah sudutnya yaitu 180derajat.
=> 2(x+18) + 3x-1 = 180
2x + 36 + 3x -1 = 180
5x - 35 = 180
5x = 180 - 35
5x = 145
x = 145 : 5
x = 29 derajat
sudut B = 3x29-1 = 87-1 = 86
sudut A dan sudut B = x+18 = 29+18 = 47derajat
dan 47+47+86=180
Jadi, sudut C = 47derajat