A and B are two fixed points of a circle C(O,R) m is a variable point of the circle (C) .
[MI] and [AR] are two heights of the triangle AMB .
H is the orthocenter of the triangle AMB
the line (MH) cuts the circle (c) again at E
prove that the triangles BIM , HAL and AIE are similar .
verify that the line (AB) is perpendicular bisector OF [HE].
designate by o' the point so that (AB) is the perpendicular bisector of [OO'] .
verify that OHEO' is an isosceles trapezoid and that O'H equal to the radius r .
what is the geometric locus of H when M describes the circle (C) ?
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