Properties of Similar Triangles

Move point A, B or C to create any triangular shape.[br][br]1. DEF is similar to triangle ABC. What makes them similar?[br]2. Use point E to create create other triangles similar to triangle ABC. Observe what change and what does not change.
What stays the same for similar triangles?
What changes for similar triangles?
What do you call the ratio between side lengths of similar triangles?
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Information: Properties of Similar Triangles