Geometry · Transformations
Dilation
HSG-SRT.A.1
Definition
A transformation that resizes a figure by a scale factor from a fixed center point.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- A dilation with scale factor k = 2 doubles the size of the figure.
- A dilation with scale factor 1/2 shrinks the figure to half its size.
Key rule
A dilation changes a figure's size but keeps it similar to the original.
Memory hook
Resize from a center point — shape stays the same, size changes.