Activity: Symmetry of Shapes
Let's find symmetry in shapes!
You will need some shapes. You could buy some, or make your own like this:
You can find if a shape has a Line of Symmetry by folding it.
When the folded part sits perfectly on top (all edges matching), then the fold line is a Line of Symmetry.
Here I have folded a rectangle one way, and it didn't work.
So this is not a Line of Symmetry
But when I try it this way, it does work (the folded part sits perfectly on top, all edges matching):
So this is a Line of Symmetry
Let us try the Octagon (the 8-sided shape)
Is this a Line of Symmetry?
Let's try folding it:
Yes! When folded over, the edges match perfectly
So let us draw it on:
I found another way too::
|Tried this||It works!|
So let us draw it on, too:
In fact I found 8 Lines of Symmetry:
|How about this Triangle?|
|I tried this fold, but it didn't work:|
Can you find any Lines of Symmetry in that triangle? I couldn't.
But how about other types of triangle?
Now it is your turn ... pick a shape and find its Lines of Symmetry.
In fact, try them all! See what you discover.
Final Note: The Circle
How about the Circle? Did you find any Lines of Symmetry?
In fact the circle has infinite Lines of Symmetry, how about that!