Similarity and Transformations

How to find out in a image in similarity and what transformations happend?

How to find out in an image is similar?

How to find if an image is similar? To find out if an image is similar is to another image. You  write each sides that are congruent to each other then, you count the units of the smaller image and then of the bigger image.It is a form of a fractions. If it ends up with the same number at the end it is similar ,but if does not it is not similar.

An example:

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