Question

define circum-center of a triangle

Answer 1

Any circle drawn around a polygon, or two-dimensional shape with straight sides, in such a way that it passes through each of the vertices of the polygon is called a circumcircle of that polygon. ... Furthermore, we have some nice formulas for finding the lengths of the circumradius of atriangle and of a regular polygon.

Answer 2

The three perpendicular bisector of triangle meets at a common point,which is equidistant from the vertices of the triangle, is called circumcentre of triangle.

Hope it will help