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Translation Review

Before we begin our discussion of rotational and reflectional symmetry, let's take a moment to review translation.

Remember that translation moves an object to another location without changing the shape and size of the original figure. Let's work through one example.

Translate the following triangle 3 units up and 4 units to the left. Where does the final triangle end up on the coordinate plane? Click on the Answer button to check your work.

coordinate plane

You must move each of the vertices 3 units up and 4 units to the left. The new triangle is shown below.

coordinate plane

Now, let's talk about two more symmetries that preserve the size and shape of an object.