Try this Drag the orange dots on each

vertex
to reshape the triangle. Note the way the three perpendicular bisectors always meet at a point - the circumcenter

One of several centers the triangle can have, the circumcenter is the point where the
perpendicular
bisectors of a triangle intersect.
The circumcenter is also the center of the triangle's circumcircle -
the circle that passes through all three of the triangle's vertices. As you reshape the triangle above, notice that the circumcenter may lie
outside the triangle.

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