Pedal Point at Vertice of Triangle ABC

When the pedal point is located at a vertice of triangle ABC, the pedal
triangle becomes degenerate. This is seen in the picture below. Notice that
the pedal point is located at the same point as vertice B of triangle ABC
and vertices S and T of the pedal triangle. Since two of the three vertices
of the pedal triangle are located at the same point there is only the point
where S and T are and point R to form a triangle and since this is actually
only two points they define a line which is called the Simson Line(in green).

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