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The pedal triangle of any triangle
 , is the triangle whose vertices are the feet of perpendiculars from  ,  and  to their opposite sides in
 .
In this figure, the
 is the pedal triangle of
 .
In general, for any point  inside a triangle, the pedal triangle of  is a triangle whose vertices are the feet of perpendiculars from  to the sides of the triangle.
In the following figure, the
 is the pedal triangle of  in
 .
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