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∠BAC + ∠DAC = 90
3x + 3x = 90
6x = 90
x = 90/6
x = 15
∠BOC = ∠AOB = 3y
∠BOC + ∠AOB = 180
3y + 3y = 180
6y = 180
y = 180/6
y = 30