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<p><big>Triangle centers on the Euler line</big></p>
<p><big>Individual centers</big></p>
<p>Euler showed in 1765 that in any triangle, the orthocenter, circumcenter and centroid are <a href="page.php?w=Line_%28geometry%29">collinear</a>. This property is also true for another <a href="page.php?w=triangle_center">triangle center</a>, the <a href="page.php?w=nine-point_center">nine-point center</a>, although it had not been defined in Euler's time. In equilateral triangles, these four points coincide, but in any other triangle they are all distinct from each other,</p><p>
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