如图,在平面直角坐标系中,矩形ABCO的面积为15,边OA比OC大2,E为BC的中点,以OE为直径的⊙O′交X轴于D点过D点作DF⊥AE于F.(1)求证:DF是⊙O′的切线;(2)小明在探究过程中发现△OCE相似于△ABE,
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![如图,在平面直角坐标系中,矩形ABCO的面积为15,边OA比OC大2,E为BC的中点,以OE为直径的⊙O′交X轴于D点过D点作DF⊥AE于F.(1)求证:DF是⊙O′的切线;(2)小明在探究过程中发现△OCE相似于△ABE,](/uploads/image/z/5902902-54-2.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E7%9F%A9%E5%BD%A2ABCO%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA15%2C%E8%BE%B9OA%E6%AF%94OC%E5%A4%A72%2CE%E4%B8%BABC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E4%BB%A5OE%E4%B8%BA%E7%9B%B4%E5%BE%84%E7%9A%84%E2%8A%99O%E2%80%B2%E4%BA%A4X%E8%BD%B4%E4%BA%8ED%E7%82%B9%E8%BF%87D%E7%82%B9%E4%BD%9CDF%E2%8A%A5AE%E4%BA%8EF%EF%BC%8E%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ADF%E6%98%AF%E2%8A%99O%E2%80%B2%E7%9A%84%E5%88%87%E7%BA%BF%EF%BC%9B%282%29%E5%B0%8F%E6%98%8E%E5%9C%A8%E6%8E%A2%E7%A9%B6%E8%BF%87%E7%A8%8B%E4%B8%AD%E5%8F%91%E7%8E%B0%E2%96%B3OCE%E7%9B%B8%E4%BC%BC%E4%BA%8E%E2%96%B3ABE%2C)
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