All three perpendicular bisectors meet at a point. This is called a point of concurrency, which is when three or more lines intersect at the same point. The point of concurrency for the perpendicular bisectors is called the circumcenter. Can the circumcenter be outside the triangle? If so, when?

Using the triangle above, create segments from the circumcenter (D) to each vertex (A, B and C). Then use the measure tool to find the length of each of those segments. Move the vertices around. What did you find?