2 The intersection point of concurrency of the three perpendicular bisectors is called the?

Circumcenter.

The circumcenter of a triangle is the center of the circumcircle of the triangle. It is the point, O, at which the perpendiculars bisectors of the sides of a triangle are concurrent.

The circumcircle of a triangle is the circle that passes through the three vertices. Its center is at the circumcenter.