### Present Remotely

Send the link below via email or IM

• Invited audience members will follow you as you navigate and present
• People invited to a presentation do not need a Prezi account
• This link expires 10 minutes after you close the presentation

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

You can change this under Settings & Account at any time.

# Section 12.5 - Dilations

Notes for Holt Geometry section 12.5
by

## Emily Kjesbo-Johnson

on 27 May 2010

Report abuse

#### 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