Berdasarkan gambar diatas, nilai (x+y-z)-(z-y-x) adalah

x° = 180° - 83°
y° = 115°

Mencari Sudut Z :
x+y-z = 0
83 + 115 - z = 0
198° - z = 0
198° = z
z = 198°

Atau :
z-y-x = 0
z - 115 - 83 = 0
z = 115 + 83
z = 198°

Dit * (x+y-z) - (z-y-x) *
Jawab : (83+115-198)-(198-83-115)
==> (198-198)-(198-198)
Hasil Akhir => 0 - 0 = 0°

Semua :
X° = 83°
Y° = 115
Z° = 75°
(x°+y°-z°) - (z°-y°-x°)
(83°+115°-75°) - (75-115°-83°)
(198° - 75°) - (- 40° - 83°)
123° - (- 123°)
Jadi Hasilnya 123° + 123° = 246°
Jawabannya Option (C)