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Translation
Slide!
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Reflection
Flip!
Click here to get your Reflection on!
Click here to make some reflection art!!!
Rotation
Turn Around!
Click here to get your Rotation on!
After any of these transformations (turn around, flip or slide), the shape still has the same size, area, angles and line lengths. In all these transformations congruence is preserved.

Congruent or Similar
If one shape can become another using only Turns, Flips and/or Slides, then the two shapes are called Congruent.
Two shapes are Similar if you need to Resize for one shape to become another (you may also Turn, Flip and/or Slide).
Dilation
The other important Transformation is Dilation (also called reduction or enlargement). The new image becomes bigger or smaller.
Dilation 
Enlarge or Reduce 

Click here to get your Dilation on!
So, if one shape can become another using transformation, the two shapes are either Congruent or Similar.
If one shape is transformed…  The image is ____ to the original.  
… using only Rotate, Reflect and/or Translate 
Congruent 

… using a Dilation (may also Rotate, Reflect and/or Translate) 
Similar 