# What is an example of Isometry?

Isometry. A transformation that is invariant with respect to distance. That is, the distance between any two points in the pre-image must be the same as the distance between the images of the two points. Isometries: Reflections, rotations, translations, glide reflections.
A.

### What is preserved in a reflection?

A reflection is called a rigid transformation or isometry because the image is the same size and shape as the pre-image. The reflection line, m, is the perpendicular bisector of the segments joining each point to its image. Properties preserved under a line reflection from the pre-image to the image.
• #### What is preserved in a rigid motion?

The concepts of congruence, similarity, and symmetry can be understood from the perspective of geometric transformation. Fundamental are the rigid motions: translations, rotations, reflections, and combinations of these, all of which are here assumed to preserve distance and angles (and therefore shapes generally).
• #### What is a rigid motion in math?

A rigid motion of the plane ( or an isometry ) is a motion which preserves distance. There are four basic rigid motions: (1) Reflection. (2) Glide Reflection. (3) Rotation.
• #### Which transformation preserves only angle measurement?

As the sticker rotates around the center of the tire, its shape does not change, so the star's side lengths and angle measurements are unchanged. In general, when we rotate a shape about a point, we preserve length and angle measurement, so rotation is a rigid transformation.
B.

### Is a dilation is an isometry?

An isometry, such as a rotation, translation, or reflection, does not change the size or shape of the figure. A dilation is not an isometry since it either shrinks or enlarges a figure. An isometry is a transformation where the original shape and new image are congruent.
• #### What does an isometric transformation preserve?

An isometric transformation (or isometry) is a shape-preserving transformation (movement) in the plane or in space. The isometric transformations are reflection, rotation and translation and combinations of them such as the glide, which is the combination of a translation and a reflection.
• #### What is not a rigid transformation?

There are four main types of transformations: translation, rotation, reflection and dilation. These transformations fall into two categories: rigid transformations that do not change the shape or size of the preimage and non-rigid transformations that change the size but not the shape of the preimage.
• #### What happens when you dilate a line?

When a figure is dilated, a segment (side) of the pre-image that does not pass through the center of dilation will be parallel to its image. Concept 3: The dilation of a line segment is longer or shorter in the ratio given by the scale factor.

Updated: 3rd September 2018