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What if two images are alike in just some ways, but not all?

Earlier in this lesson, you identified images that are congruent. In this activity, you will see three images again, all very similar to each other in some way. However, one of the images in each set is not quite like the other two--it is less similar. See if you can determine which image does not belong in each set.

Odd Shape Out

Which image is most unlike the other two?

Blue droplet.


Green droplet squished.


Orange droplet.


This image is fairly similar to another image in the set.

This image is not as similar to the other images in the set. It is squished compared to the other two.

This image is fairly similar to another image in the set.

Which image is most unlike the other two?

Red triangle.


Yellow triangle.


Green triangle that's arched.


This image is fairly similar to another image in the set.

This image is fairly similar to another image in the set.

This image is not as similar to the other images in the set. It is slightly more arched than the other two.

Which image is most unlike the other two?

Purple pentagon.


Buldged out pentagon.


Red pentagon.


This image is fairly similar to another image in the set.

This image is not as similar to the other images in the set. It is slightly wider and a bit indented compared to the other two.

This image is fairly similar to another image in the set.

You got # out of # correct. Click the Retry button for another attempt.

You got a perfect score. Great job!

You may have noticed that the two most similar images in each set were different sizes, but were the same shape. When two objects are identical in shape with equal corresponding angles and proportional sides, the two shapes are similar to each other. 

Question

Are congruent shapes also similar shapes?

Yes, congruent shapes must be similar in shape also because their corresponding sides and angles are identical. However, not all similar shapes are congruent. Their angles may have the same measurement, while their sides do not.