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Section 12.5 - Dilations

Notes for Holt Geometry section 12.5
by

Emily Kjesbo-Johnson

on 27 May 2010

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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 transcript