1 ) Let [tex] P [/tex] be an arbitary point in the plane of triangle [tex] \vartriangle ABC [/tex] , let [tex] A' [/tex] be a point on [tex] BC [/tex] such that [tex] A'B \bot PA [/tex](adsbygoogle = window.adsbygoogle || []).push({});

, Define [tex] B' , C' [/tex] in the same way,P rove that [tex] A' , B' ,C' [/tex] are collinear.

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# Nice Problem ( Geometry)

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