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Dilating algebraically about a point | Geometry (TX TEKS) | Khan Academy
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https://www.khanacademy.org/math/geometry-tx/x790e3ac3e338c450:transformations-in-the-plane/x790e3ac3e338c450:building-advanced-transformations/v/dilating-algebraically-about-a-point
Dilate a figure about a point other than the origin on the plane and in algebraic coordinate notation. We can do this by translating the plane so the center of dilation is at the origin, dilating about the origin, and then translating the plane back.
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