
An Euler line is a line that passes through the orthocenter, centroid, and circumcenter of a triangle.^{[1]} In manipulative 1, the Euler line is the blue line. Click on the blue points in manipulative 1 and drag them to change the figure. The Euler line was first described by Leonhard Euler in Novi Commentarii academiae scientarum imperialis Petropolitanae 11: 103–123. Since the introduction of the Euler line, many other triangle centers have been found that are on the Euler line, including the center of the 9 point circle. 
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