Agenda:

1. Take notes on “Distance Formula”

2. Return Spirals and Quizzes and tell each student the 5th Marking Period grades

3. If you want to make quiz corrections, you may do so after the lesson

On a separate sheet of paper. WRITTEN OUT COMPLETELY!

4. Homework on “Distance Formula”

5. Quiz on Monday, 5/16/2011

Distance Formula

Mrs. King and Mr. Zampetti

Geometry

Unit 12, Day 8

Getting Started…

Kayleigh walks to a friend’s house by traveling 5 blocks west and then 12 blocks north. She returns home later by cutting diagonally through her neighbors’ yards. What distance did she travel on her voyage home?

Kayleigh’s Journey…222 cba 222 125 c214425 c

2169 c2169 c

c135

1213

Distance on the coordinate plane The distance between two points and

on the coordinate plane (graph) can be found using the formula:

221

221 yyxxd

11, yx 22 , yx

http://www.bsin.k12.nm.us/schools/BHS/math/joinmath/geometry/GEO1_3.pps#257,4,Slide 4

Find the distance between (-3, 2) and (4, 1)

x1 = -3, x2 = 4, y1 = 2 , y2 = 1

( 3 4)2 (2 1)2d =

( 7)2 (1)2 49 1d =

50 or 5 2 or 7.07d =

2 22 1 2 1( ) ( )x x y y

Example:

http://teachers.henrico.k12.va.us/math/igo/01Fundamentals/1-3Formulas/LECTURE1-3.ppt#259,3,The Distance Formula

Homework

Work Packet: Distance Formula