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maka
180° = 5x + 7x
180° = 12x
x = 180°÷12
x = 15°
sudut penyiku = 90°
maka
90° = 15° + a
a = 90°-15°
a = 75°
sudut penyiku x adalah 75°
12x=180
x=180:12=15°
Penyiku=90-15=75°
sorry kalo salah