Проведем AE⊥BC
∠B=45-15=30, ∠EAB=60
AE=AB/2=AD (катет против угла 30)
=> △AED - равносторонний, AE=ED
∠EDC=60-45=15 =∠ECD => △CED -р/б, CE=ED =AE
=> △CEA -р/б, ∠ACE=90/2=45
∠ACD =45-15 =30°
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Проведем AE⊥BC
∠B=45-15=30, ∠EAB=60
AE=AB/2=AD (катет против угла 30)
=> △AED - равносторонний, AE=ED
∠EDC=60-45=15 =∠ECD => △CED -р/б, CE=ED =AE
=> △CEA -р/б, ∠ACE=90/2=45
∠ACD =45-15 =30°