8th Grade · Geometry
Center of Dilation
8.G.A.4
Definition
The fixed point from which a figure is enlarged or reduced. Each point moves along a ray from this center, scaled by the scale factor.
Examples
- If the center is the origin, multiply each coordinate by the scale factor.
- Distance to the image = scale factor × distance to the preimage.
Key rule
Every point moves along a ray from the center of dilation.
Memory hook
The fixed point the figure scales from.