The Lemoine hexagon is a cyclic hexagon with vertices given by the six intersections of the edges of a triangle and the three lines that are parallel to the edges that pass through its symmedian point. The circumcircle of the Lemoine hexagon is the first Lemoine circle. There are two definitions of the hexagon that differ based on the order in which the vertices are connected.

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  • The Lemoine hexagon is a cyclic hexagon with vertices given by the six intersections of the edges of a triangle and the three lines that are parallel to the edges that pass through its symmedian point. The circumcircle of the Lemoine hexagon is the first Lemoine circle. There are two definitions of the hexagon that differ based on the order in which the vertices are connected. The Lemoine hexagon can be drawn defined in two ways, first as a simple hexagon with vertices at the intersections as defined before. The second is a self-intersecting hexagon with the lines going through the symmedian point as three of the edges and the other three edges join pairs of adjacent vertices. For the simple hexagon drawn in a triangle with side lengths <math>a, b, c and area <math>\Delta the perimeter is given by p = \frac{a^3+b^3+c^3+3abc}{a^2+b^2+c^2} and the area by a = \frac{a^4+b^4+c^4+a^2b^2+b^2c^2+c^2a^2}{\left(a^2+b^2+c^2 \right)^2} \Delta For the self intersecting hexagon the perimeter is given by p = \frac{\left(a+b+c\right) \left(ab+bc+ca\right)}{a^2+b^2+c^2} and the area by a = \frac{a^2b^2+b^2c^2+c^2a^2}{\left(a^2+b^2+c^2\right)^2}\Delta
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  • The Lemoine hexagon is a cyclic hexagon with vertices given by the six intersections of the edges of a triangle and the three lines that are parallel to the edges that pass through its symmedian point. The circumcircle of the Lemoine hexagon is the first Lemoine circle. There are two definitions of the hexagon that differ based on the order in which the vertices are connected.
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  • Lemoine hexagon
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