## Circumcircle of Triangle | ## more ... |

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. | |