已知,如图RT三角形ABC中,角A=30°,角C=90度,角BDC =60°,BC=6cm,求AD的长.求完整解题过程.
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![已知,如图RT三角形ABC中,角A=30°,角C=90度,角BDC =60°,BC=6cm,求AD的长.求完整解题过程.](/uploads/image/z/3710922-42-2.jpg?t=%E5%B7%B2%E7%9F%A5%2C%E5%A6%82%E5%9B%BERT%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E8%A7%92A%3D30%C2%B0%2C%E8%A7%92C%3D90%E5%BA%A6%2C%E8%A7%92BDC+%3D60%C2%B0%2CBC%3D6cm%2C%E6%B1%82AD%E7%9A%84%E9%95%BF.%E6%B1%82%E5%AE%8C%E6%95%B4%E8%A7%A3%E9%A2%98%E8%BF%87%E7%A8%8B.)
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