Texas Instruments TI-89 User Manual page 57

Checking Properties of Objects
Tip: Position the text box to
the desired location before
pressing ¸ to display the
result.
Note: The displayed
property changes when the
two segments are no longer
perpendicular.
Determining if a
Point Lies on an
Object
TI-89 / TI-92 Plus / Voyage™ 200 PLT Cabri Geometry App
(continued)
4. Press ¸ to display the property.
5. Drag the endpoint of one of the
segments so that they are no longer
perpendicular.
The tool evaluates a point to dtermine whether or not it lies
Member
on an object.
1. Construct a point and a circle as
shown to the right.
2. Press
2ˆ
TI-89:
TI-92 Plus / Voyage™ 200 PLT:
and select
8:Check Property
select 4:Member .
3. Select the point (point to it and
press ¸).
4. Point to the circle and then press
¸.
5. If desired, move the empty text box
to an easy-to-read location.
Press ¸ to display the property
6.
in the text box.
If you drag the point to lie on the circle, the displayed property
automatically changes to
postioned so that it is mathematically on the circle. This may not be
easy to do by simply dragging the point of the circle. To position the
point mathematically, use
toolbar menu.
ˆ
, and then
. However, the point must be
Member
in the †
Redefine Object Construction
53