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### Course: 8th grade>Unit 6

Lesson 7: Congruence and similarity

# Geometric transformations: FAQ

## What are geometric transformations?

Geometric transformations are ways of moving or changing a shape on a coordinate plane. Four common types are translations, rotations, reflections, and dilations.

## What's the difference between a translation and a rotation?

A translation moves a shape up, down, left, or right. A rotation, on the other hand, turns the shape around a fixed point.

## What's the difference between a reflection and a dilation?

A reflection flips a shape over a line, while a dilation makes a shape bigger or smaller by a certain factor.

## What are some properties and definitions we should know about transformations?

There are a few key vocabulary words and properties to keep in mind. For example, congruent shapes are exactly the same size and shape, while similar shapes have the same shape but may be different sizes.
Some transformations — like reflections, rotations, and translations — preserve congruence. But dilations do not preserve congruence, since a dilation changes the size of a figure.

## Where are transformations used in the real world?

Transformations are all around us! For example, in art, artists might use reflections to create symmetry. In architecture or engineering, rotations and dilations might be used to create scale drawings or models.

## Want to join the conversation?

• :Summery of Text
For All you people who read comments

A transformation is what we do to an object.
A rotation is how we rotate an object from 1 degrees to 359 degrees. A Translation is how we determine how much the object moves left, right, up, or down. A reflection is how we reflect the shape across a line of axis. A dilation is how big we change shape's size.
• I need more explanation.
• a dilation is when the shape is scaled to another size
a reflection is like a mirror
a translation is like sliding, but only vertically or horizontally
a rotation is anchoring a point down and turning it.

translation, rotation, and reflection are rigid transformations, but dilation isn't.

a shape is congruent to another shape if they only need to use rigid transformations to map them onto one another.

similar shapes are shapes that need to be dilated to map onto one another.

i hope that helped
• I really do not understand the concept. I am a 5th grader and I do not know I I got here. Is this the backrooms?
• Inspiring quote for today...
We were born to be real not perfect.
anybody else have a good quote?
• "Ideas are the seeds to creation..."
-Menachem Landon
(1 vote)
• What job is this for?
• i'm pretty sure you need to know this as an architect