Think of it like this: if you could pick up one shape and perfectly place it on top of another, so they completely match up, then those two shapes are congruent.
Here are some key points about congruent shapes:
* Same sides: All corresponding sides are equal in length.
* Same angles: All corresponding angles are equal in measure.
* Can be rotated or flipped: Congruent shapes can be rotated or flipped (reflected) and still be considered congruent.
Example:
Two triangles are congruent if:
* Their three sides are equal in length.
* Their three angles are equal in measure.
Symbol:
The symbol for congruence is ≅. So, if triangle ABC is congruent to triangle DEF, we write it as:
△ABC ≅ △DEF