Recall that the 120°-point of a triangle is the point so that if the segments from that point to the three vertices of the triangle are drawn, three 120° angles are formed.

*point of equal tension*for points A, B, and C. In other words, if three people, one standing at each of A, B, and C were to pull with equal tension on three lengths of rope connected at a single point, then that point would stabilize to point P.

- How does the point of minimum distance generalize to four or more foci?
- How can I describe the contours that are the locus of all points of a fixed distance-sum?