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11.6.7  Find the orthocenter of a triangle in the plane: orthocenter

The orthocenter command take a triangle (or three points representing the vertices of a triangle) as argument and returns the orthocenter of the triangle. Entering
Input:

orthocenter(triangle(0,1+i,-1+i))

or
Input:

orthocenter(0,1+i,-1+i)

draws the point (0,0), the orthocenter of the triangle.


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