如图,四边形ABCD内接于以AB直径的半圆O,且弧DC=弧CB,过点C作EF垂直于AB于E,交AD延长线于F.延长BC,交交AF于G,BD交EF于P.求证1).CE^2=PE*EF.2).GD*GA=2AB*EB
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![如图,四边形ABCD内接于以AB直径的半圆O,且弧DC=弧CB,过点C作EF垂直于AB于E,交AD延长线于F.延长BC,交交AF于G,BD交EF于P.求证1).CE^2=PE*EF.2).GD*GA=2AB*EB](/uploads/image/z/11673080-8-0.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E5%86%85%E6%8E%A5%E4%BA%8E%E4%BB%A5AB%E7%9B%B4%E5%BE%84%E7%9A%84%E5%8D%8A%E5%9C%86O%2C%E4%B8%94%E5%BC%A7DC%3D%E5%BC%A7CB%2C%E8%BF%87%E7%82%B9C%E4%BD%9CEF%E5%9E%82%E7%9B%B4%E4%BA%8EAB%E4%BA%8EE%2C%E4%BA%A4AD%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8EF.%E5%BB%B6%E9%95%BFBC%2C%E4%BA%A4%E4%BA%A4AF%E4%BA%8EG%2CBD%E4%BA%A4EF%E4%BA%8EP.%E6%B1%82%E8%AF%811%29.CE%5E2%3DPE%2AEF.2%29.GD%2AGA%3D2AB%2AEB)
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