如图,已知△ABC的周长是21,OB,OC分别平分∠ABC和∠ACB,OD⊥BC于点D,且OD=3,求△ABC的面积.下面是图画的不太好``大虾们将就看下``
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![如图,已知△ABC的周长是21,OB,OC分别平分∠ABC和∠ACB,OD⊥BC于点D,且OD=3,求△ABC的面积.下面是图画的不太好``大虾们将就看下``](/uploads/image/z/3879509-5-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E7%9A%84%E5%91%A8%E9%95%BF%E6%98%AF21%2COB%2COC%E5%88%86%E5%88%AB%E5%B9%B3%E5%88%86%E2%88%A0ABC%E5%92%8C%E2%88%A0ACB%2COD%E2%8A%A5BC%E4%BA%8E%E7%82%B9D%2C%E4%B8%94OD%3D3%2C%E6%B1%82%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF.%E4%B8%8B%E9%9D%A2%E6%98%AF%E5%9B%BE%E7%94%BB%E7%9A%84%E4%B8%8D%E5%A4%AA%E5%A5%BD%60%60%E5%A4%A7%E8%99%BE%E4%BB%AC%E5%B0%86%E5%B0%B1%E7%9C%8B%E4%B8%8B%60%60)
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