∠CAD=∪CD/2=∠BCD
△ABC~△CBD
AB =BC*AC/CD
BD =BC*CD/AC
AD= AB-BD =6(12/4√3 -4√3/12) =4√3
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∠CAD=∪CD/2=∠BCD
△ABC~△CBD
AB =BC*AC/CD
BD =BC*CD/AC
AD= AB-BD =6(12/4√3 -4√3/12) =4√3