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7x + 8 + 5x + 4 = 180
12x + 12 = 180
12x = 180-12
12x = 168
x = 14
*sudut A = 7x+8
= 7.14 + 8
= 98 + 8 = 106 derajat.
Ditanya : Besar sudut A
Jawab : Sudut A + Sudut B = 180
7x + 8 + 5x + 4 = 180
12x + 12 = 180
12x = 180-12
12x = 168
x = 168/12
x = 14
Sudut A = 7x+8
= 7(14)+8
= 98 + 8
= 106 derajat
Jadi besar sudut A adalah 106 derajat --> jawabannya yang A