一道初二梯形证明题~梯形ABCD中,AD‖BC,AB=CD,∠B=60°,BC=20cm,梯形的周长为50cm.求梯形ABCD的另外三边长和梯形的面积.在梯形ABCD中,AB‖DC,DE‖CB,△AED的周长为18,EB=4,求梯形ABCD的周长.
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![一道初二梯形证明题~梯形ABCD中,AD‖BC,AB=CD,∠B=60°,BC=20cm,梯形的周长为50cm.求梯形ABCD的另外三边长和梯形的面积.在梯形ABCD中,AB‖DC,DE‖CB,△AED的周长为18,EB=4,求梯形ABCD的周长.](/uploads/image/z/5907983-23-3.jpg?t=%E4%B8%80%E9%81%93%E5%88%9D%E4%BA%8C%E6%A2%AF%E5%BD%A2%E8%AF%81%E6%98%8E%E9%A2%98%7E%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E2%80%96BC%2CAB%3DCD%2C%E2%88%A0B%3D60%C2%B0%2CBC%3D20cm%2C%E6%A2%AF%E5%BD%A2%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA50cm.%E6%B1%82%E6%A2%AF%E5%BD%A2ABCD%E7%9A%84%E5%8F%A6%E5%A4%96%E4%B8%89%E8%BE%B9%E9%95%BF%E5%92%8C%E6%A2%AF%E5%BD%A2%E7%9A%84%E9%9D%A2%E7%A7%AF.%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAB%E2%80%96DC%2CDE%E2%80%96CB%2C%E2%96%B3AED%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA18%2CEB%3D4%2C%E6%B1%82%E6%A2%AF%E5%BD%A2ABCD%E7%9A%84%E5%91%A8%E9%95%BF.)
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