MaterialsDE Marker15 Small White BoardsReminders

Musical Math

Use similar triangles to find the length of side x:

10

150

7.5

6

x

Get out your agenda if you see your name below. You need to come to my room

tomorrow.

Period 4 Period 5 Period 6

CORNELL NOTES

TOPIC:

ESSENTIAL QUESTION(S):

Stretching and Shrinking:Scale and Scale Factor

How do I determine scale and scale factor between models and reality?

CORNELL NOTES

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:

CORNELL NOTES

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

CORNELL NOTES

Questions: Notes:

How do I write scale? Example:

A map shows 2 inches = 6 feet

Write this as a ratio:

=

Simplify so that the numerator has a length of one.

(3)13

𝑐𝑚=(3)2𝑚𝑒𝑡𝑒𝑟𝑠

1𝑐𝑚=6𝑚𝑒𝑡𝑒𝑟𝑠

CORNELL NOTES

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.

Class Activity1. Work on WS 5-8 Practice A with your table partner2. We will work the problems together3. Be prepared to share with the class

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HomeworkWS 5-8 Practice A

and BAND Cornell Notes

Summary