Fold shapes, letters, and everyday objects in half to discover symmetry hiding all around you.
A shape is symmetric if you can fold it along a line so that both halves match up exactly. That fold line is called a line of symmetry.
If you fold a butterfly picture down the middle and both wings match exactly, what does that tell you?
The picture is symmetric, and the fold line is its line of symmetry
Is a square symmetric if folded corner to corner?
Yes, both triangular halves match exactly
Some shapes have just one line of symmetry, some have several, and some have none at all. A circle has the most — infinitely many, since any line through its center splits it into matching halves.
How many lines of symmetry does a circle have?
Infinitely many — any line through the center works
How many lines of symmetry does an equilateral triangle have?
3
1. How many lines of symmetry does a rectangle have?
2. Does the letter 'T' have a line of symmetry?
3. Does the letter 'F' have a line of symmetry?
4. How many lines of symmetry does a square have?
5. If a face looks almost the same on both sides when folded down the middle, what is that an example of?