1. In the diagram at the left, AB is a horizontal line segment.
Distance Formula
In the diagram at the left, AB is a horizontal line segment.
You can find its length by subtracting the x-coordinate of A
from the x-coordinate of B. The length of AB is
Similarly, you can find the length of CD by subtracting the
y-coordinate of C from the y-coordinate of D.
The length of CD is
For any two points NOT on a horizontal or vertical line, you can graph the points and form a right triangle. You can then use the Pythagorean theorem to find the distance between the points.

2. Distance Formula cont.
1. Find the distance between T (1, -5) and V (3,-2).
Round to the nearest tenth if necessary.
2. Find the distance between the pair of points. (7, -3) and (-8, -3)
3. Find the exact lengths of each side of a triangle.
Then find the perimeter to the nearest tenth.