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Transformations

The three main Transformations are:

Rotation Turn!
Reflection Flip!
Translation Slide!

After any of those transformations (turn, flip or slide), the shape still has the same size, area, angles and line lengths.
   
If one shape can become another using Turns, Flips and/or Slides, then the two shapes are called Congruent.

Resizing

The other important Transformation is Resizing (also called dilation, contraction, compression, enlargement or even expansion). The shape becomes bigger or smaller:

Resizing Resize!

If you have to use Resizing to make one shape become another then the shapes are not Congruent, they are Similar.

Congruent or Similar

So, if one shape can become another using transformation, the two shapes might be Congruent or just Similar

If you ...   Then the shapes are ...
... only Rotate, Reflect and/or Translate 

Congruent

... need to Resize

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