When you have finished this page, try the Symmetry Quiz.
Symmetry is when a figure has two sides that are mirror images of one another. It would then be possible to draw a line through a picture of the object and along either side the image would look exactly the same. This line would be called a line of symmetry.
Some figures have more than one line of symmetry.
There are two kinds of symmetry. One is bilateral symmetry in which an object has two sides that are mirror images of each other. The human body would be an excellent example of a living being that has bilateral symmetry. An equilateral triangle would be a geometric example of bilateral symmetry. Can you think of other examples in nature or with inanimate objects that have bilateral symmetry?
The other kind of symmetry is radial symmetry. This is where there is a center point and numerous lines of symmetry could be drawn. The most obvious geometric example would be a circle.