Spanish language learning forums - Relationships with Triangles

Well, tomorrow is the test on Relationships with Triangles. I hope I do well. Current grade in Honors Geometry: 97%

I am OK with everything, but I need some hints that well help me seperate the difference between these:

*Circumcenter: the point of concurrency of 3 perpendicular bisectors
*Incenter: the point of concurrency of the 3 angle bisectors of a triangle
*Centroid: the point of concurrency of the medians of a triangle
*orthocenter: point of concurrency of the altitudes of a triangle