Introducing Scale Copies!

Introducing Scale Copies!

I can describe some characteristics of a scaled copy.

I can tell whether or not a figure is a scaled copy of another figure.

Review Vocabulary

A ratio is a comparison or relationship between two numbers.
A scale is ratio between two sets of measurements.
Example:
•Drawings: ¼ inch = 1 foot
•Maps: 1 inch = 250 miles

Multiple Choice

Is a scale a type of ratio?

• YES

• NO

SCALE DRAWINGS

•A scale drawing (model) is a drawing that uses a scale to make an object smaller than (reduction) or larger than (enlargement) the real object.

Multiple Choice

What is a scale drawing?

• a small picture

• the numbers on a map

• a drawing that is either smaller or larger than the real object

• a relationship between two numbers using division

Think of one word to describe each letter. Compare the original picture to the lettered picture. 

Multiple Select

You can click the image to enlarge it. Which letters do you think are scaled copy of the original?

• A

• B

• C

• D

• E

Scale Copy Characteristics

• All corresponding angles are equal

• Equivalent ratios for side lengths

• A copy of a figure where every length in the original figure is multiplied by the same number

• Pictures that appear stretched vertically or horitzonatally are not scale copies

Multiple Select

What are the two characteristics of scale copies?

• the scale copy should be stretched and slanted

• corresponding sides create equivalent ratios

• All corresponding angles have the same value

• scale copies have nothing in common

Open Ended

How do you know these two shapes are scale copies?

Multiple Select

Why are the "W's" pictured NOT scale copies?

• The W looks wide or stretched horizontally

• The W is a smaller version of the original

• The W is a larger version of the original

• The W looks tall or stretched vertically

Whole Class Review!

• What is a scale?

• What are the two characteristics of a scale copy?

What's Next?

Go to google classroom and click on classwork for week of September 8 - 11 and begin completing the assignment!

Video for Additional Help

https://www.youtube.com/watch?v=Y5g2JLxcWmM&list=PLfuJ6kc7tzESHSeC8B-wSkDgIMdIsKtz7