Dilations
Presentation
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Mathematics
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7th - 8th Grade
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Practice Problem
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Hard
Erin Hathcock
Used 21+ times
FREE Resource
12 Slides • 0 Questions
1
Dilations
Please read through each slide carefully. After this lesson, you will know all about dilations!
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Enlarging/Stretching
An Figure:
If you have a scale factor greater than 1, the figure will get bigger.
For example, if the scale factor is 2, the figure will double in size.
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Shrinking a Figure:
If you have a scale factor that is less than 1, the image will get smaller.
For example, if the scale factor is 1/2 or 0.5, the image will be half the size of the pre-image.
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How does it change?
MULTIPLY the coordinates by the Scale Factor.
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Scale Factor of 1
This means the figure stays the same size.
This is uncommon as the figure does not change from pre-image to image.
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Example of a Scale Factor greater than 1
The figure has stretched or been enlarged.
The pre-image is the purple triangle and the image is the green triangle.
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So what is the Scale Factor?
Let's look at one of the points.
Point C (2, 1)
Point C' (4, 2)
How did the points increase?
Answer: Each coordinate was multiplied by 2. Therefore the scale factor is 2!
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Example of a Scale Factor is less than 1
The figure has shrunk.
The pre-image is the purple triangle and the image is the blue triangle.
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What is the Scale Factor?
Let's look at one of the points - pick any point.
Point A (2, 6)
Point A' (1, 3)
How did the coordinates change?
The numbers got smaller. Each number was divided by 2. This means that the scale factor is 1/2.
12
Dilations
Please read through each slide carefully. After this lesson, you will know all about dilations!
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