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# Section 12.5 - Dilations

Notes for Holt Geometry section 12.5

by

Tweet## Emily Kjesbo-Johnson

on 27 May 2010#### Transcript of Section 12.5 - Dilations

Section 12.7 - Dilations Write the I Can:

I Can identify & draw dilations of geometric figures What does it mean for something to dilate? Math Book Definition: A dilation is a transformation that changes the size of a figure, but not the shape.

The preimage (before) and image (after) are SIMILAR. What does that

mean again? Examples of Dilations These are NOT dilations

Why Not? Dilations in the

coordinate plane We can perform

dilations on

figures in the

coordinate plane! Here's how a question might look: dilation tells us

what we're doing to the figure

(in the case, making it bigger or smaller) These are the coordinates

of the original figure.

Our first step is to

graph these coordinates This dilation is centered

at the origin.

All of the dilations we do

in our geometry class will be. The Scale Factor tells us

everything we need to know

about how to create the dilation.

In this case, each x and y value

will be multiplied by -2 to form

the new figure. Here are the steps you need to follow: Does it look like a

DILATION? Your turn!

Try the following dilations! Any Questions?

Full transcriptI Can identify & draw dilations of geometric figures What does it mean for something to dilate? Math Book Definition: A dilation is a transformation that changes the size of a figure, but not the shape.

The preimage (before) and image (after) are SIMILAR. What does that

mean again? Examples of Dilations These are NOT dilations

Why Not? Dilations in the

coordinate plane We can perform

dilations on

figures in the

coordinate plane! Here's how a question might look: dilation tells us

what we're doing to the figure

(in the case, making it bigger or smaller) These are the coordinates

of the original figure.

Our first step is to

graph these coordinates This dilation is centered

at the origin.

All of the dilations we do

in our geometry class will be. The Scale Factor tells us

everything we need to know

about how to create the dilation.

In this case, each x and y value

will be multiplied by -2 to form

the new figure. Here are the steps you need to follow: Does it look like a

DILATION? Your turn!

Try the following dilations! Any Questions?