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# The Unit Rate as the Scale Factor - 7.1 - Lesson 17

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Author: Todd Parks
##### Description:

Student Outcomes

• Students recognize that the enlarged or reduced distances in a scale drawing are proportional to the corresponding distance in the original picture.
• Students recognize the scale factor to be the constant of proportionality.
• Given a picture or description of geometric figures, students make a scale drawing with a given scale factor.

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Tutorial

## The What and How

A scale factor is a number which scales, or multiplies, some quantity.

In the equation y = Cx, C is the scale factor for x. C is also the coefficient of x, and may be called the constant of proportionality of y to x.

For example, doubling distances corresponds to a scale factor of 2 for distance, while cutting a cake in half results in pieces with a scale factor of ½.

## Scale Factor Power Point

Download the powerpoint using the circle button with an arrow inside of it that is up top to the right. You will then be able to play all of the animation in the slide show.
Be sure to also turn up the volume on your computer when you come to the question portion of the power point. Sounds will tell you whether you are choosing correctly or incorrectly.

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