Answers:
1) Circumcenter
2) Incenter
3) Centroid
4) Orthocenter
the answers are in the same order as each bullet point
These terms are what you should have memorized or on a reference sheet
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Notes:
1) The circumcenter is the center of the circle that goes through the three vertices of the triangle. This circle is known as the circumcircle
2) The incenter is the center of the incircle. The incircle is a circle that is as large as possible such that it is completely contained in the triangle. There are no parts of the incircle that spill over to the outside of the triangle. All of this circle is inside the triangle.
