Texas Instruments TI-89 User Manual page 58

Checking Properties of Objects
Determining if
Points are
Equidistant
TI-89 / TI-92 Plus / Voyage™ 200 PLT Cabri Geometry App
(continued)
The tool evaluates any three points to determine whether
Equidistant
or not the first point is equidistant from the two remaining points.
1. Construct a point and a segment as
shown.
2. Press
2ˆ
TI-89:
TI-92 Plus / Voyage™ 200 PLT:
select
8:Check Property,
select .
5:Equidistant
3. Select the point (point to it and
press ¸).
4. Point to each of the segment's
endpoints, pressing ¸ each time.
5. If desired, move the empty text box
to an easy-to-read location.
Press ¸ to display the property
6.
in the text box.
As with the tool, simply dragging the point so that it appears
Member
to be equidistant may not change the displayed property. To position
the point so that it is equidistant mathematically, you can create a
perpendicular bisector for the segment. Then use
the †
Construction toolbar menu to position the point on the
perpendicular bisector.
ˆ,
and then
Redefine Object
in
54