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[ª] , [©] , [^]
, [¨]Area of a triangle of which three points are each foot of perpendicular / Confirming with measurement (Maximum)**(GC World : Various Problems ,MaxEMin)

There are ƒ¢ABC and point P.

Perpendicular feet drawn from point P to three sides are named D, E, and F respectively.

If point P moves, when will the area of ƒ¢DEF be maximized?

GC/Win