When a shape has reflective symmetry, one half is a perfect reflection of the other half.
The two halves of this triangle are exact reflections of each other.
The diamond below also has reflective symmetry.
If you can fold a shape in half perfectly, it has reflective symmetry.
Notice that the top and bottom halves reflect each other.
The line of symmetry is what divides a shape into two parts that are exact reflection of each other.
Squares have a vertical line of symmetry.
They also have a horizontal line.
Square even have diagonal lines of symmetry.
Squares have 4 lines of symmetry!
Can you think of other shapes with more than 1 line of symmetry?
Non-symmetrical objects have no line of symmetry.
Look at the triangle below.
When we fold it horizontally, the two halves are not the same.
When we fold it vertically, the two halves do not mirror each other.
This triangle has no line of symmetry.
How many lines of symmetry do circles have?
It's actually infinity!
Great work learning about reflective symmetry.
Now, try the practice to help you remember for longer.