dilation, enlargement, reduction, transformation
TEKS 8(1)(D), 8(1)(G), 8(10)(A), 8(10)(D)
A dilation is a transformation that moves each point along the ray through the point starting from a fixed center, and multiplies distances from the center by a common scale factor.
If a vertex of a figure is the center of dilation, then the vertex and its image after the dilation are the same point.
The scale factor is the ratio of a length in the image to the corresponding length in the original figure.
scalefactor . equals , 6 thirds , comma or 2