Similarity
A dilation stretches or shrinks a shape by a scale factor from a fixed center point: a scale factor of 2 doubles every distance from the center, while a scale factor of 1/2 shrinks it by half. Two shapes are similar if one can be turned into the other using dilations along with rotations, reflections, and translations, which is also why two triangles sharing the same two angles (AA) are always similar even if their side lengths differ.
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Midterm
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This final covers a lot of topics, so it's split into 2 parts. Each part includes a question from every one of its topics.
Final, Part 1 of 2
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Final, Part 2 of 2
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