如图∠B=∠FAC=90°BC=3cm,AB=4cm,AF=12cm,求正方形CDEF的面积
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![如图∠B=∠FAC=90°BC=3cm,AB=4cm,AF=12cm,求正方形CDEF的面积](/uploads/image/z/3878904-48-4.jpg?t=%E5%A6%82%E5%9B%BE%E2%88%A0B%3D%E2%88%A0FAC%3D90%C2%B0BC%3D3cm%2CAB%3D4cm%2CAF%3D12cm%2C%E6%B1%82%E6%AD%A3%E6%96%B9%E5%BD%A2CDEF%E7%9A%84%E9%9D%A2%E7%A7%AF)
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