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A dilation is a type of transformation that changes the size of the image. The scale factor, sometimes called the scalar factor, measures how much larger or smaller the image is. Below is a picture of a dilation with a scale factor of 2. This means that the image, A', is twice as large as the pre-image A. Like other transformations, prime notation is used to distinguish the image fromthe pre-image. The image always has a prime after the letter such as A' .

resource: http://www.mathwarehouse.com/transformations/dilations/dilations-in-math.php

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Dilations could be enlargements or reductions. In enlargements, k is greater than 1. In reductions, k is less than 1.

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Q: In geometry what is a dilation?
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