Texas Instruments TI-89 User Manual page 24

Creating Points
Creating a Point on
an Object
Creating an
Intersection Point
TI-89 / TI-92 Plus / Voyage™ 200 PLT Cabri Geometry App
(continued)
The tool creates points on any existing object. The
Point on Object
point is placed at the location of the cursor. It remains permanently
attached to the object—you can drag the point to move it, but it will
always remain on the object.
1. Create any object, such as the
triangle shown in this example.
2. Press „ and select
3. Move the cursor toward the object
until a cursor message appears for
the object.
4. Press ¸ to create the point.
The tool creates a point at the intersection (or
Intersection Point
intersections) of any two defined objects. If the objects are changed
so that they no longer intersect, the intersection point disappears.
The intersection point reappears when the objects again intersect.
1. Create any two intersecting objects,
such as the circle and line shown in
this example. (If necessary, see pages
21 and 24.)
2. Press „ and select
Point .
3. Select the first object of two
intersecting objects then press ¸.
4. Select the second object then press
¸ to create the intersection point
or points.
.
2:Point on Object
Point to the object.
Create the point.
3:Intersection
Select the first object.
Select the second object.
Points are created at each
intersection.
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