Videos and lessons to help High School students learn how to
verify experimentally the properties of dilations given by a
center and a scale factor:
A. A dilation takes a line not passing through the center of the
dilation to a parallel line, and leaves a line passing through the
B. The dilation of a line segment is longer or shorter in the
ratio given by the scale factor.
Common Core: HSG-SRT.A.1
Dilations in Geometric Figures
This video explains the concept of dilating a geometric figure,
scale factor, and work through some basic examples involving
Dilation and Scale Factor Part 1
In this lesson dilation and scale factor are defined. Then using
examples we discuss positive and negative scale factor as well as
scale factors that are greater than or less than one.
Dilation and Scale Factor Part 2
In this lesson we calculate scale factor and show dilation on a
graph (coordinate plane).
Constructing a Dilation
Using a compass and straight edge to construct the dilation of a
Dilations in Two Dimensions
This Demonstration allows you to explore some of the features of
dilation , also called expansion or enlargement, in two dimensions.
You can change the center of dilation. You can drag or add locators
to change the shape of the object. You can also see the lines
joining vertices to their images. This Demonstration is designed as
a class activity, so by projecting the image on a whiteboard or an
interactive board, students can demonstrate their skill by
predicting the position of any hidden object.
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