The figures are names as follows
a. Incenter
b. Circumcenter
c. Centroid
d. Orthocenter
Features of incenter, circumcenter, centroid, and orthocenter
The incenter is the point where the angle bisectors of a triangle intersect. The incenter is equidistant from all three sides of the triangle.
The circumcenter is the point where the perpendicular bisectors of a triangle's sides intersect. The circumcenter is equidistant from all three vertices of the triangle.
The centroid is the point where the medians of a triangle intersect.
The orthocenter is the point where the altitudes of a triangle intersect.