On a number line, the number halfway between x1 and x2 is
Find the midpoint between –1 and 4.
Use the formula. The midpoint is
(–1 + 4)/2
= 3/2 or 1.5.
Suppose you are given two points in the plane (x1, y1) and (x2, y2), and asked to find the point halfway between them. The coordinates of this midpoint will be:
An easy way to think about this is that the x-coordinate of the midpoint is the average of the x-coordinates of the two points, and likewise with the y-coordinate.
Find the midpoint between (–2, 5) and (7, 7).
Use the formula. The coordinates of the midpoint are:
It's pretty easy to guess based on the last two formulas!
In 3-dimensional space, the midpoint between (x1, y1, z1) and (x2, y2, z2) is