## orthocenter ,centroid,circumcenter,circumcircle, Euler line

1. The three altitudes of meet at a common point. This point is called the

**orthocenter**of the triangle

2. The three lines from each vertex to the midpoint of the opposite side also meet at a common point called

**centroid**of the triangle

3. The lines that pass through the midpoint of each side and is perpendicular to the side (the perpendicular bisector) also meet at a common point called the

**circumcenter**of the triangle

4. The circumcenter is the center of the circle passing through the three vertices of the triangle. This circle is called the

**circumcircle**

**5. The orthocenter, the centroid, and the circumcenter of a triangle line on a straight line. This line is called the**

**Euler line**. The line was named after the great mathematician Leonhard Euler

**More topics ..............**

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