Respuesta :

Step-by-step explanation:

∆ADB and ∆CDB

has length AB = CB

DB _|_ AC

so length AD= CD

4=y

y=4

if ∆ADB=CDB

mBAD = mBCD

mBCD =52°

m∆CDB=180°

so x=m∆CDB-mBCD

x=180°-52°

x=128°

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