Geometric isometries are transformations that preserve distance between any two points. This means that if you have two points A and B, and you apply an isometry to get A' and B', the distance between A and B will be exactly the same as the distance between A' and B'.
The main types of isometries in a plane are:
- Translation: Sliding every point by the same distance in the same direction.
- Rotation: Turning every point around a fixed center point by the same angle.
- Reflection: Flipping every point across a fixed line.
- Glide reflection: A combination of a reflection and a translation parallel to the line of reflection.
These transformations are fundamental in geometry because they describe ways to move shapes around without changing their size or shape.
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