Count lines of symmetry
Key Notes:
A line of symmetry divides a shape into two regions that are mirror images of each other across the line.
Learn with an example
How many lines of symmetry does this shape have?
Look at the shape.
To find a line of symmetry, look for two halves of the U that are mirror images of each other.
The right half of U is the mirror image of the left half. So, the vertical line that passes through the middle of U is a line of symmetry.
There are no other ways to split U so that the halves are mirror images of each other. So, this is the only line of symmetry.
How many lines of symmetry does this shape have?
Look at the shape.
There are no ways to split R so that the halves are mirror images of each other.So, there are no lines of symmetry.
How many lines of symmetry does this shape have?
Look at the shape.
There are no ways to split P so that the halves are mirror images of each other.So, there are no lines of symmetry.
let’s practice!
