对角线相等的平行四边形是矩形
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![对角线相等的平行四边形是矩形](/uploads/image/z/3685627-19-7.jpg?t=%E5%AF%B9%E8%A7%92%E7%BA%BF%E7%9B%B8%E7%AD%89%E7%9A%84%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%E6%98%AF%E7%9F%A9%E5%BD%A2)
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