angle bisector
line or ray that splits an angle in half
circumcenter
the point where perpendicular bisectors meet
incenter
where the angle bisector intersects
circumcenter SP
the circumcenter is equidistant from the VERTICES of the triangle
incenter SP
the incenter is equidistant from the SIDES of the triangle
median
a segment that connects a vertex to the midpoint of the opposite side
centroid
the place where all medians intersect
centroid SP
splits each median into pieces that are 1/3 and 2/3 of median length
altitude
a segment starts at a vertex and goes perp to the opposite side.
orthocenter
The point where the altitudes intersect
angle - side
longest side is always across from the largest angle