Vocabulary

Transformation: A transformation is an operation that maps an original geometric figure, the preimage, onto a new figure called the image.

Dilation: A transformation that enlarges or reduces a figure by a scale factor.

Scale Factor: A scale factor is the ratio of the lengths of two corresponding sides of two similar polygons. 

Concept

Identify the terms based on the vocabulary used for transformation (dilation).

Rules

Identify and select the correct answer choice based on the properties of dilation.

Example

A preimage and an image, when dilated, will always have which of the following?

Solution

By definition, a preimage and image are always the same shape but not necessarily the same size. The figures can be different sizes but do not have to be if the k value is 1.  

Pre-requisite Skills

Rotation (8.7.3)

Reflection (8.7.2)

Translation (8.7.1)