mas ∡B=60°⇒m∡C=30∡⇒AB=24:2=12cm (Teorema unghiuluide 30°in tr.dr.) mas ∡B=60°⇒m∡BAC=30°⇒BC=AD:2=12:2=6cm (Teorema unghiuluide 30°in tr.dr.) as simple as that!!
extra pr.1 m∡CAB=(180-130)/2=25° AD inaltime (ipoteza) deci ΔACD dreptunghic m∡ACD=90°-25°=65°