Texas Instruments TI-89 User Manual page 48

Creating Reflections and Inverse Objects
Creating a
Symmetrical Image
Modifying a
Symmetrical Image
Note: Because a
symmetrical image is a
dependent object, you
cannot change it directly.
TI-89 / TI-92 Plus / Voyage™ 200 PLT Cabri Geometry App
The tool creates the image of an object that is rotated 180
Symmetry
degrees around a point.
1. Create a polygon and a point as
shown in this example.
2. Press ‡ and select
5:Symmetry
3. Select the object to rotate 180
degrees.
4. Select the point of symmetry.
You can modify a symmetrical image by changing the original object
or by moving the point of symmetry.
1. Grab and drag a vertex of the original
object. (Upper right vertex of the
original object shown in step 1.)
The symmetrical image is modified
according to the changes made to the
original object.
(continued)
.
Select the object to rotate.
Select a point.
The symmetrical image is
created.
The symmetrical image is
modified.
44