Congruent
Imagine you have two identical LEGO bricks.

No matter how you move them around, they are exactly the same. In math, we call that congruent.

Here is how you can check if two shapes are congruent:

    Slide it: Move one shape over to the other.
    Flip it: Like looking in a mirror.
    Turn it: Spin it around like a clock hand.

If one shape fits perfectly on top of the other after you move it, they are congruent!

      
The Parts Matter Too:
   
Angles: If two corners are open the exact same amount, those angles are congruent.
   
   
Sides: If two edges are the exact same length, those sides are congruent.

Basically, "congruent" is just a fancy math word for identical twins