8.3A Similar Figures

• During translations, reflections, and rotations, the pre image and image are congruent

• During a dilation, the pre image and image are similar. Let's talk about the difference...

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Congruent vs Similar

Congruent figures are both the same size and the same shape. Therefore all the side lenghts of the image are the same as the pre image.

​​Congruent

​SImilar figures are the same shape but different sizes. What's special about them is their proportionality.

​​Similar

We can set up proportions of corresponding sides of similar figures to solve for a missing side length.

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Set up a proportion that could be used to find the length of side PQ.

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• Sometimes there are no numbers, just labeled vertices. But that's okay! We can still set up a proportion.

• Write 3 examples of proportions that would be true about the similar figures.

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​No Numbers?

Now you will try the practice problems assigned to you in Eduphoria. Do your best!