Texas Instruments TI-89 User Manual page 11

Learning the Basics
Deleting Objects
Labeling Points and
Objects
Note: A point appears with
a label "a" beside it.
Note: Another point, a
segment connecting the two
points, and a label "b"
appear.
Note: The completed
triangle appears as well as
the label "c" beside the last
point created.
Dependent and
Independent
Objects
TI-89 / TI-92 Plus / Voyage™ 200 PLT Cabri Geometry App
(continued)
To delete objects, select them using the procedures described on the
previous page and press 0 (backspace key) or
TI-92 Plus / Voyage™ 200 PLT:
in the toolbar menu).
File
You can label points and objects in the following two ways:
¦
As you create them (see below).
¦
With the tool in the
Label
Labeling objects as they are created is intended for quick access and
is limited to five alphanumeric characters. Label editing is not
available; however, after constructing the object, you can edit a label
with the tool.
Label
1. Press ... and select
3:Triangle
2. Move the (#) cursor to the desired
location and press ¸ to create the
first point. Press
j
TI.89: A
TI-92 Plus / Voyage 200 PLT: A
3. Move the cursor and press ¸ to
create the second point then press
j
TI.89: B
TI-92 Plus / Voyage 200 PLT: B
4. Move the cursor and press ¸ to
create the third point then press
j
TI.89: C
TI-92 Plus / Voyage 200 PLT: C
You create all objects using one or more points. The manner in
which you create an object determines whether or not it is
dependent or independent of the object. This distinction becomes
important with respect to dragging objects.
A point constructed by itself is called a basic point. To identify basic
points, select the
Pointer
‚ once. All basic points will flash and can be
Voyage 200 PLT:
dragged.
An independent object is an object created using only basic points.
Independent objects can be moved (dragged) but cannot be modified
directly. By moving the basic points used for their construction, you
can modify them indirectly.
TI-89:
Š then select
7:Delete
Display menu (see page 60).
.
Define and label the first
point.
Define and label the second
point.
Define and label the third
point.
j
tool and press
TI-89:
2Š
(delete option
TI-92 Plus /
7