The perpendicular bisectors of the sides of a triangle intersect at a single point called the circumcenter. The circumcenter is equidistant from the triangle's vertices and can be used to locate the circle that passes through all three vertices (the circumscribed circle). Similarly, the angle bisectors of a triangle intersect at the incenter, which is equidistant from the triangle's sides and located inside the triangle. The document provides examples of finding the circumcenter and using the incenter to solve a math problem involving a triangle.