1. The Distance and Midpoint Formulas
Lesson 9-6 Pages
The Distance and Midpoint Formulas
Lesson Check 9-5

2. What you will learn!
How to use the Distance Formula to determine lengths on a coordinate plane.
Use the Midpoint Formula to find the midpoint of a line segment on the coordinate plane.

3. Vocabulary
Distance Formula
Midpoint
Midpoint Formula

4. What you really need to know!
On a coordinate plane, the distance between two points with coordinates (x1 , y1) and (x2 , y2) is given by:

5. What you really need to know!
The midpoint of a line segment whose endpoints are (x1 , y1) and (x2 , y2) is given by:

7. Example 1:
Find the distance between M(8 , 4) and N(-6 , -2). Round to the nearest tenth, if necessary.

10. Find the perimeter of ∆XYZ to the nearest tenth.
Example 2:
Find the perimeter of ∆XYZ to the nearest tenth.

11. Side XY: X(-5 , 1), Y(-2 , 4)

12. Side XZ: X(-5 , 1), Z(-3 , -3)

13. Side YZ: Y(-2 , 4), Z(-3 , -3)

15. Find the coordinates of the midpoint of RS.
Example 3:
Find the coordinates of the midpoint of RS.

17. Page 468
Guided Practice
#’s 4-8

19. Pages 466-468 with someone at home and study examples!
Read:
Pages with someone at home and study examples!

20. #’s 10-30 even #’s 33-48 Practice Quiz 2 #’s 1-5
Homework: Pages
#’s even
#’s 33-48
Practice Quiz 2 #’s 1-5
Lesson Check 9-6

25. Page
746
Lesson 9-6

26. Lesson Check 9-6