Trisect an interval on a line: Trisect [-2, 14].

We can find the distance, d, between the points with the Distance Formula, and then add one third of it to find the left trisecting point. From the distance formula, .

Hence the left trisecting point is at .

The right trisecting point is the same distance further to the right at .

We can check these results by adding the same distance to c₂ to see if we get the right end of the original interval: , as expected.