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NB Y = QRS
360°= 3x + 17° + 5x + 7x + y
360°-17° = 15x + y
y= 343°-15x
cari x:
sudut yg berhadapan didalam lingkaran jumlahnya 180°
180° = 5x + 7x
12x = 180°
x = 15°
y = 343° - 15(15°)
y = 343° - 225° = 118°