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## What rigid transformations are congruent?

**Reflections, translations, rotations**, and combinations of these three transformations are “rigid transformations”. While the pre-image and the image under a rigid transformation will be congruent, they may not be facing in the same direction.

## What 2 things are congruent or preserved in a rigid motion?

Rigid motion – A transformation that preserves distance and angle measure (**the shapes are congruent, angles are congruent**). Isometry – A transformation that preserves distance (the shapes are congruent).

## What are the two characteristics of a rigid transformation?

A rigid transformation does not change the size or shape of an object. **Measurements such as distance, angle measure, and area** do not change when an object is moved with a rigid transformation. Rigid transformations also preserve collinearity and betweenness of points.

## Are rigid transformations always congruent?

We now know that the rigid transformations (reflections, translations and rotations) preserve the size and shape of the figures. That is, **the pre-image and the image are always congruent**.

## Why are rigid motions congruent?

Geometric figures are said to be congruent if they can be mapped onto each other using one or more rigid motions. Because rigid motions preserve angle and length measurements, congruent figures **have the same angles measures and side lengths**. The quadrilaterals below are all congruent to each other.

## How are rigid transformations used to justify SAS congruence theorem?

Answer:Rigid transformations **preserve segment lengths and angle measures**. A rigid transformation, or a combination of rigid transformations, will produce congruent figures. In proving SAS, we started with two triangles that had a pair of congruent corresponding sides and congruent corresponding included angles.