从圆O外一点P作圆O的两条切线,分别切圆O于点A,B,过AB弧上任意一点C作圆O的切线分别交PA,PB于点E,F.(1)若PA=a,求△PEF的周长.(2)连接OF,OE,若∠P=40°,求∠FOE
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![从圆O外一点P作圆O的两条切线,分别切圆O于点A,B,过AB弧上任意一点C作圆O的切线分别交PA,PB于点E,F.(1)若PA=a,求△PEF的周长.(2)连接OF,OE,若∠P=40°,求∠FOE](/uploads/image/z/8107059-3-9.jpg?t=%E4%BB%8E%E5%9C%86O%E5%A4%96%E4%B8%80%E7%82%B9P%E4%BD%9C%E5%9C%86O%E7%9A%84%E4%B8%A4%E6%9D%A1%E5%88%87%E7%BA%BF%2C%E5%88%86%E5%88%AB%E5%88%87%E5%9C%86O%E4%BA%8E%E7%82%B9A%2CB%2C%E8%BF%87AB%E5%BC%A7%E4%B8%8A%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9C%E4%BD%9C%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF%E5%88%86%E5%88%AB%E4%BA%A4PA%2CPB%E4%BA%8E%E7%82%B9E%2CF.%EF%BC%881%EF%BC%89%E8%8B%A5PA%EF%BC%9Da%2C%E6%B1%82%E2%96%B3PEF%E7%9A%84%E5%91%A8%E9%95%BF.%EF%BC%882%EF%BC%89%E8%BF%9E%E6%8E%A5OF%2COE%2C%E8%8B%A5%E2%88%A0P%EF%BC%9D40%C2%B0%2C%E6%B1%82%E2%88%A0FOE)
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