Symmetry and Congruence
What is Symmetry?
Symmetry means both sides match! You can check with a fold or a mirror line.
Fold a shape down the middle.
If both sides match perfectly, it has symmetry!
Interactive visualization — available in the full lesson
Fold Line
What is Congruence?
Congruent shapes are exactly the same! They can be turned or flipped and still match.
Same size. Same shape.
They match if you put them together.
Interactive visualization — available in the full lesson
These squares are congruent!
Interactive Examples
Now you try! Test symmetry and congruence with these activities.
Symmetry Explorer
Drag the blue line. If the overlay matches perfectly, you found a line of symmetry!
Interactive visualization — available in the full lesson
Congruence Builder
Move, rotate, or flip the shape until it sits exactly on its partner.
Interactive visualization — available in the full lesson
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Look For Symmetry Around You!
- Your face has symmetry!
- Butterflies have symmetry!
- The letter A has symmetry!
- Hearts have symmetry!