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 Circumcircle of Triangle

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The circle that passes through all vertices (corner points) of a triangle.

Try moving the points below, and notice:

* the center (called the circumcenter) can be inside or outside of the triangle.

* the center is where three special lines cross: lines that are at right angles to the midpoint of each side of the triangle.

* also try putting the points on grid lines and see what interesting things you can discover.

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