Intro to Dilations

Presentation

•

Mathematics

•

7th - 8th Grade

•

Easy

•

CCSS

8.G.A.3, 8.G.A.4, HSG.SRT.A.2

Standards-aligned

Cassidy Batiz

Used 325+ times

FREE Resource

4 Slides • 10 Questions

Intro to Dilations

Key Concepts:

A DILATION stretches of shrinks a figure.
The CENTER OF DILATION never changes position. It is the starting point.
The SCALE FACTOR tells you how much the dilation stretches or shrinks.

A DILATION is a transformation that produces an image that is the same shape as the pre-image, but is a different size. Dilations create similar figures.

Scale factor is greater than 1
Image gets BIGGER

Enlargement

Scale factor is less than 1
Image gets SMALLER

Reduction

Multiple Choice

First, identify the old and new image. Now, did the triangle get bigger or smaller?

The triangle got smaller

The triangle got bigger

Multiple Choice

First, identify the old and new image. Now, did the triangle get bigger or smaller?

The triangle got smaller

The triangle got bigger

Multiple Choice

Is this an enlargement or a reduction?

Enlargement

Reduction

Multiple Choice

Is this an enlargement or a reduction?

Enlargement

Reduction

Multiple Choice

A dilation always produces a similar figure. Similar figures have the same ______ but different ______.

measure; shapes

sizes; shapes

value; measures

shape; sizes

Multiple Choice

A scale factor of 1/2 reduces a figure.

True

False

Multiple Choice

A dilation creates a similar figure, NOT a congruent figure.

True

False

Multiple Choice

Dilations always result in CONGRUENT images.

true

false

Multiple Choice

A dilation that increases in size will always have a scale factor that is...

negative

exactly 1

greater than 1

less than 1

Multiple Choice

In this dilation, point A would be considered...

the center of dilation

the scale factor

the center of rotation

the point of no return

Intro to Dilations

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