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mencari x
6x+4°+5x+9°=90°
6x+5x+4°+9°=90°
11x+13°=90°
11x=90°-13°
11x=77°
x=77°:11
x=7°
penyiku sudut AQC adlh sudut CQB
sudut CQB=5x+9=5×7+9=44°✔