The center of a triangle's circumcircle.

It is where the "perpendicular bisectors" (lines that are at right angles to the midpoint of each side) meet.

Try moving the points below, the circumcenter is where the lines meet. Notice that the circumcenter can be inside or outside of the triangle:

It is where the "perpendicular bisectors" (lines that are at right angles to the midpoint of each side) meet.

Try moving the points below, the circumcenter is where the lines meet. Notice that the circumcenter can be inside or outside of the triangle:

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