Respuesta :

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B+A=m (DCB)


two interior angles sum is exterior angle



3y+22+4y=106


7y=106-22


7y=84


y=12


m (A)=4y=4.12=48


m (B)=3y+22=3.12+22=58


m (BCA)+106=180


m (BCA)=74

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