1. Materials DE Marker 15 Small White Boards Reminders

2. Use similar triangles to find the length of side x: 10 150 7.5 6 x

3. Get out your agenda if you see your name below. You need to come to my room tomorrow. Period 4Period 5Period 6

4. Stretching and Shrinking: Scale and Scale Factor How do I determine scale and scale factor between models and reality?

5. Questions:Notes: What does scale mean? Scale – the ratio of a length on a drawing or model to the length of an actual object Note: a Scale can have different units Example:

6. Questions:Notes: What does scale factor mean? Scale Factor – gives how many TIMES larger or smaller an object is Note: a Scale Factor must have the same units and can be written using a colon (ex. 1:23,000) Example: 1:16,000,000 1:1,300,000

7. Questions:Notes: How do I write scale?

8. Questions:Notes: How do I determine scale factor? Make sure both amounts are using the SAME UNITS. 1 inch on a map = 10 feet in reality Since there at 12 inches in a foot 1 inch = 10(12) inches 1 inch = 120 inches 1:120 The scale factor from the map to reality is 120. THIS MEANS THAT IF WE MULTIPLY A MEASURMENT ON THE MAP BY 120, WE WILL GET THE LENGTH IN THE REAL WORLD.

9. Class Activity 1.Work on WS 5-8 Practice A with your table partner 2.We will work the problems together 3.Be prepared to share with the class

10. Class Activity

19. Homework WS 5-8 Practice A and B AND Cornell Notes Summary