已知四边形ABCD中,AB⊥AD,BC⊥CD,AB=BC,∠ADC=120°. 将一块足够大的三角尺MNB的30°角顶点与四边形顶点B重合,当三角尺的30°角(∠MBN)绕着点B旋转时,它的两边分别交边AD,DC所在直线于E,F. (
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![已知四边形ABCD中,AB⊥AD,BC⊥CD,AB=BC,∠ADC=120°. 将一块足够大的三角尺MNB的30°角顶点与四边形顶点B重合,当三角尺的30°角(∠MBN)绕着点B旋转时,它的两边分别交边AD,DC所在直线于E,F. (](/uploads/image/z/2615783-23-3.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2CAB%E2%8A%A5AD%2CBC%E2%8A%A5CD%2CAB%EF%BC%9DBC%2C%E2%88%A0ADC%EF%BC%9D120%C2%B0%EF%BC%8E%E3%80%80%E5%B0%86%E4%B8%80%E5%9D%97%E8%B6%B3%E5%A4%9F%E5%A4%A7%E7%9A%84%E4%B8%89%E8%A7%92%E5%B0%BAMNB%E7%9A%8430%C2%B0%E8%A7%92%E9%A1%B6%E7%82%B9%E4%B8%8E%E5%9B%9B%E8%BE%B9%E5%BD%A2%E9%A1%B6%E7%82%B9B%E9%87%8D%E5%90%88%2C%E5%BD%93%E4%B8%89%E8%A7%92%E5%B0%BA%E7%9A%8430%C2%B0%E8%A7%92%EF%BC%88%E2%88%A0MBN%EF%BC%89%E7%BB%95%E7%9D%80%E7%82%B9B%E6%97%8B%E8%BD%AC%E6%97%B6%2C%E5%AE%83%E7%9A%84%E4%B8%A4%E8%BE%B9%E5%88%86%E5%88%AB%E4%BA%A4%E8%BE%B9AD%2CDC%E6%89%80%E5%9C%A8%E7%9B%B4%E7%BA%BF%E4%BA%8EE%2CF%EF%BC%8E%E3%80%80%28)
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