2. Points of Concurrency The point where three or more lines intersect.

3. Median of a Triangle A segment from one vertex of the triangle to the midpoint of the opposite side.

4. The intersection of the medians is called the CENTROID. How many medians does a triangle have?

5. Angle Bisector

6. The intersection of the angle bisectors is called the INCENTER. How many angle bisectors does a triangle have?

7. What is special about the INCENTER? Equidistant to sides of the triangle

9. The intersection of the perpendicular bisector is called the CIRCUMCENTER. How many perpendicular bisectors does a triangle have?

10. What is special about the CIRCUMCENTER? Equidistant to the vertices of the triangle.

11. Altitude

12. The intersection of the altitudes is called the ORTHOCENTER. How many altitudes does a triangle have?

13. Tell whether each red segment is an altitude of the triangle. The altitude is the “true height” of the triangle.