# Simalarities and Transformations

## Dilation, Scale factor & Similarity

Scale factor and similarity help make up a dilation. A dilation is when a shape or an image is enlarged or shrunk and it has to remain similar to the pre-image by using scale factor. Scale factor is  the ratio that tells us how to enlarge or shrink the image. To enlarge an image the scale factor must be greater than 1, to shrink an image/shape the scale factor must be between 0 and 1, and to keep an image/shape the same size as the pre-image the scale factor must be 1. In the image above you can see that the scale factor is 2 and since all the sides of the post-image are congruent to the sides of the pre-image that makes the image similar to the pre-image.

# Translations

A translation is when you slide a figure without turning expanding, or shrinking size.

# Rotation

A rotation is when a figure is turned from 1 degree to 360 degrees.

# Reflection

A reflection is when a figure is flipped over the mirror line (line of reflection) in he X or Y axis.