Question 1045546
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It is the center of the circle circumscribed about the triangle with the given vertices.


This point (the center) is the common intersection point of three straight lines that are the perpendicular bisectors of the sides of that triangle.


See the lesson 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Triangles/Perpendicular-bisectors-of-a-triangle-sides-are-concurrent.lesson>Perpendicular bisectors of a triangle sides are concurrent</A>

in this site.


Also, &nbsp;be informed that you have this free of charge online textbook on Geometry

&nbsp;&nbsp;&nbsp;&nbsp;<A HREF=https://www.algebra.com/algebra/homework/Triangles/GEOMETRY-your-online-textbook.lesson>GEOMETRY - YOUR ONLINE TEXTBOOK</A> 

in this site.