Middle-Earth is the midpoint on a timeline with Earth as one endpoint. What is the other endpoint?

Midpoint Formula

In the following video, Sal takes us through the inductive process leading to the midpoint formula. Duration: 6:40

Geometry 2(A) determine the coordinates of a point that is a given fractional distance less than one from one end of a line segment to the other in one- and two-dimensional coordinate systems, including finding the midpoint

Geometry 2(B) derive and use the distance, slope, and midpoint formulas to verify geometric relationships