Video

Side lengths after dilation (Full video)

Khan Academy

Supporting grades: 8

Description: Sal dilates a shape and then compares the side lengths of the pre-image and image. Created by Sal Khan. Draw the image of triangle ABC under a dilation whose center is P and a scale factor of 2. So essentially, we want to scale this so that every point is going to be twice as far away from P. So if this maps to point B, we just want to go twice as far.

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