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    14．······························································································ 已知△ABC的周长为24.AB＝AC.AD⊥BC于D.若△ABD的周长为20.则AD的长为························· ( )． 8 12 【查看更多】

     

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    如图，已知△ABC中，AB＝AC，它的周长为24，又AD垂直BC，垂足为D，△ABD的周长为20，则AD的长

    [　　]
    A．

    6

    B．

    8

    C．

    10

    D．

    12

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