are u sure its ad=dc=bc?

okok..sry

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are u sure its ad=dc=bc?

okok..sry

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x=2y(ext. angle = sum of int. oppoite angles.)

so DBC=ACB=2y

so BAC+ABC+BCA=180

y+2y+2y=180

5y=180

y=180/5=36°

BAC=y=36°