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No 12 sudut ZYQ = 180-ZYX
ZYX= 180-75-45= 60 drajat
jadi, ZYQ = 180 - 60 = 120 drajat
No 19
x + x + 5 + x - 2 = 180
3x + 3 = 180
3x = 180-3
3x = 177
x = 177/3 = 59
PAC= 180 - 59 =121 drajat