In the figure below, the green, red, and violet 'points' are the orthocenter, centroid, and circumcenter of triangle

The blue line above is called the

*ABC*respectively. Move the points*A*,*B*, and*C*and notice what happens. Use these points to create different types of triangles. What do you observe?The blue line above is called the

**Euler line**. The Euler line passes through the three important points determine by a non-equilateral triangle. It also passes through the center of the nine point circle.
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