An isometry is a type of transformation that preserves the length of a figure's sides. using this definition, which of the following transformations is not an isometry?
- translation
- reflection
- rotation
- stretch

Stretch

Step-by-step explanation:

- Translation: A translation moves a shape up, down or from side to side but it does not change its size.

- Reflection: A reflection is a transformation which all the points of an object reflect or flip on a line called the axis of reflection or line of reflection. This transformation does not change its size.

- Rotation: A rotation is a transformation  that turns a figure about a fixed point called the center of rotation. This transformation does not change figure's size.

- Stretch: A stretch is a transfoormation which stretch the figure (by multiplying by C>1). This transformation changes the size of the figure.

- Isometry: An isometry is a type of transformation that preserves the length of a figure's sides.

Thus, a stretch is not an isometry

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