已知在直角三角形ABC,角ACB=90度,EF垂直平分线,交AC、AB于点E、F,EF=EC,求角A的度数.已知在直角三角形ABC,角ACB=90度,EF是AB的垂直平分线,交AC、AB于点E、F,EF=EC,求角A的度数。
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![已知在直角三角形ABC,角ACB=90度,EF垂直平分线,交AC、AB于点E、F,EF=EC,求角A的度数.已知在直角三角形ABC,角ACB=90度,EF是AB的垂直平分线,交AC、AB于点E、F,EF=EC,求角A的度数。](/uploads/image/z/2935844-44-4.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%A8%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2ABC%2C%E8%A7%92ACB%3D90%E5%BA%A6%2CEF%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86%E7%BA%BF%2C%E4%BA%A4AC%E3%80%81AB%E4%BA%8E%E7%82%B9E%E3%80%81F%2CEF%3DEC%2C%E6%B1%82%E8%A7%92A%E7%9A%84%E5%BA%A6%E6%95%B0.%E5%B7%B2%E7%9F%A5%E5%9C%A8%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2ABC%2C%E8%A7%92ACB%3D90%E5%BA%A6%2CEF%E6%98%AFAB%E7%9A%84%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86%E7%BA%BF%2C%E4%BA%A4AC%E3%80%81AB%E4%BA%8E%E7%82%B9E%E3%80%81F%EF%BC%8CEF%3DEC%EF%BC%8C%E6%B1%82%E8%A7%92A%E7%9A%84%E5%BA%A6%E6%95%B0%E3%80%82)
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