Texas Instruments TI-89 User Manual page 9

Learning the Basics
Placing Points
Creating a Simple
Triangle
TI-89 / TI-92 Plus / Voyage™ 200 PLT Cabri Geometry App
(continued)
All objects are constructed using one or more points. You create or
select points when a tool is active. The order of operation is:
1. Select a construction tool.
2. Create or select the required points that define the object.
To create a point, select the
create points anywhere in the plane when the construction pencil (#)
is active. For example, to construct the two points in the plane
below:
1. Press „ and select
1:Point
2. Move the (#) cursor to the
desired location and press
¸ to create the first point.
3. To create the second point,
press the right side of the
cursor pad (B) until the
cursor is at the desired
location then press ¸.
All other objects require multiple points to complete their
construction. For example, to construct a triangle, you create three
points as shown below:
1. Press ... and select
3:Triangle
2. Move the (#) cursor to the desired
location and press ¸ to define
the first point.
3. Move the cursor to another location,
and press ¸ to define the second
point.
4. Move the cursor to the third location
and press ¸ again to complete
the triangle.
tool and press ¸. You can
Point
.
first point second point
.
third point
first point second point
5