如图1,在三角形ABC中,AD垂直BC于点D,DE垂直AB于点E,DF垂直AC于点F(1)试说明:AB的平方=BD的平方+AF×AC;∠AEF=∠C(2)如图2,若D1为AD上一点,过点D1作点D1E垂直于AB于点E,D1F垂直于AC于点F,∠AEF=∠C吗
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![如图1,在三角形ABC中,AD垂直BC于点D,DE垂直AB于点E,DF垂直AC于点F(1)试说明:AB的平方=BD的平方+AF×AC;∠AEF=∠C(2)如图2,若D1为AD上一点,过点D1作点D1E垂直于AB于点E,D1F垂直于AC于点F,∠AEF=∠C吗](/uploads/image/z/1115445-21-5.jpg?t=%E5%A6%82%E5%9B%BE1%2C%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CAD%E5%9E%82%E7%9B%B4BC%E4%BA%8E%E7%82%B9D%2CDE%E5%9E%82%E7%9B%B4AB%E4%BA%8E%E7%82%B9E%2CDF%E5%9E%82%E7%9B%B4AC%E4%BA%8E%E7%82%B9F%EF%BC%881%EF%BC%89%E8%AF%95%E8%AF%B4%E6%98%8E%EF%BC%9AAB%E7%9A%84%E5%B9%B3%E6%96%B9%3DBD%E7%9A%84%E5%B9%B3%E6%96%B9%2BAF%C3%97AC%EF%BC%9B%E2%88%A0AEF%3D%E2%88%A0C%EF%BC%882%EF%BC%89%E5%A6%82%E5%9B%BE2%2C%E8%8B%A5D1%E4%B8%BAAD%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E8%BF%87%E7%82%B9D1%E4%BD%9C%E7%82%B9D1E%E5%9E%82%E7%9B%B4%E4%BA%8EAB%E4%BA%8E%E7%82%B9E%2CD1F%E5%9E%82%E7%9B%B4%E4%BA%8EAC%E4%BA%8E%E7%82%B9F%2C%E2%88%A0AEF%3D%E2%88%A0C%E5%90%97)
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