Video

Dilations: scale factor (Full video)

Khan Academy

Supporting grades: 8

Description: Find the scale factor of a dilation that maps a given figure to another one. We are told that pentagon A'B'C'D'E', which is in red right over here, is the image of pentagon ABCDE under a dilation. So they don't even tell us the center of the dilation, but in order to figure out the scale factor you just have to realize when you do a dilation, the distance between corresponding points will change according to the scale factor. So for example we could look at the distance between point A and point B right over here.

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