Texas Instruments TI-89 User Manual page 13

Learning the Basics
TI-89 / TI-92 Plus / Voyage™ 200 PLT Cabri Geometry App
(continued)
To illustrate the basic steps in this section, the following procedure
will construct and measure a circle circumscribed around a triangle.
1. Press
2Š
TI-89:
TI-92 Plus / Voyage™ 200 PLT:
select .
3:New
2. Type a name for the variable to start a
new construction and press ¸
twice.
3. Construct and label a triangle.
(Perform steps 1 through 4 in
"Labeling Points and Objects"
described on page 7.)
4. Construct perpendicular bisectors for
two sides of the triangle by pressing
† and selecting
4:Perpendicular
.
Bisector
and press ¸.
5. Select side
AB
and press ¸.
6. Select side
BC
7. Modify the appearance of the
perpendicular bisectors from solid to
dotted lines by pressing
2‰
TI-89:
TI-92 Plus / Voyage 200 PLT:
select .
9:Dotted
8. Select a line and press ¸.
Start a new construction.
Š and
Construct and label a triangle.
Construct the first
perpendicular bisector.
Complete the perpendicular
bisectors.
Modify the lines.
‰ and
9