1. Distance and Midpoints
Section 1-3

2. Definition of Midpoint
The midpoint M of is the point between P and Q such that PM = MQ. M Q P

3. Midpoint Formulas
1. On a number line, the coordinate of the midpoint of a segment whose endpoints have coordinates a and b is M b a -2 8

4. 2. In a coordinate plane, the coordinates of the midpoint of a segment whose endpoints have coordinates (x1, y1) and (x2, y2) are

5. Segment Bisector
Any segment, line, or plane that intersects a segment at its midpoint is called a segment bisector.

6. Midpoint Theorem
If M is the midpoint of then

7. Distance Formulas
On a number line the distance between 2 points on a number line is
On a coordinate plane, the distance between 2 points is A B