Question

Which of the following does not describes a dilation?

expansion
isometry
contraction
utilizes a scale factor

Answer 1

any idea ?

Answer 2

old question but will respond so this can be closed

going through the definitions:
- expansion (increases the size of a figure by some scale factor)
- isometry (transformation that preserves the size + shape of the figure, such as a rotation or translation)
- contraction (decreases the size of a figure by some scale factor)
- utilizes a scale factor (i'll go ahead and eliminate this choice, since a dilation changes the size of a figure by a scale factor)

should be obvious from here