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What is the scale factor used to create the dilation ?

What is the scale factor used to create the dilation ?-example-1
User Quantdaddy
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The scale factor is 3. as you can see, the pre-image is 3 units wide, and 2 units long. If you dilate this by 3, then you will have the image, which is 9 units wide and 6 units long.

User Matteo Umili
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