急(限今天)已知,如图长方形ABCD中,AB=3,AD=9,将此长方形折叠,使点B与点D重合,折痕为EF,则△ABE的面积为( ).已知等腰△ABC中,底边BC=20,D为AB上一点,CD=16,BD=12.求(1)△ABC的周长(2)△ABC的面
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![急(限今天)已知,如图长方形ABCD中,AB=3,AD=9,将此长方形折叠,使点B与点D重合,折痕为EF,则△ABE的面积为( ).已知等腰△ABC中,底边BC=20,D为AB上一点,CD=16,BD=12.求(1)△ABC的周长(2)△ABC的面](/uploads/image/z/4108400-8-0.jpg?t=%E6%80%A5%EF%BC%88%E9%99%90%E4%BB%8A%E5%A4%A9%EF%BC%89%E5%B7%B2%E7%9F%A5%2C%E5%A6%82%E5%9B%BE%E9%95%BF%E6%96%B9%E5%BD%A2ABCD%E4%B8%AD%2CAB%3D3%2CAD%3D9%2C%E5%B0%86%E6%AD%A4%E9%95%BF%E6%96%B9%E5%BD%A2%E6%8A%98%E5%8F%A0%2C%E4%BD%BF%E7%82%B9B%E4%B8%8E%E7%82%B9D%E9%87%8D%E5%90%88%2C%E6%8A%98%E7%97%95%E4%B8%BAEF%2C%E5%88%99%E2%96%B3ABE%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA%EF%BC%88+%EF%BC%89.%E5%B7%B2%E7%9F%A5%E7%AD%89%E8%85%B0%E2%96%B3ABC%E4%B8%AD%2C%E5%BA%95%E8%BE%B9BC%3D20%2CD%E4%B8%BAAB%E4%B8%8A%E4%B8%80%E7%82%B9%2CCD%3D16%2CBD%3D12.%E6%B1%82%EF%BC%881%EF%BC%89%E2%96%B3ABC%E7%9A%84%E5%91%A8%E9%95%BF%EF%BC%882%EF%BC%89%E2%96%B3ABC%E7%9A%84%E9%9D%A2)
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