ABC acisi 90 bu yuzden EBA acisi 70 olur, AEB ucgeni ikiz kenar oldugundan AEB acisida 70 olur ayni zamanda EDB acisida 70 olur. bu durumda EBD acisi 40 olur.CBA acisi zaten 90 di o yuzden 40+20+a=90 ve burdan a=30 olur
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