Texas Instruments TI-89 User Manual page 14

Learning the Basics
TI-89 / TI-92 Plus / Voyage™ 200 PLT Cabri Geometry App
(continued)
9. Repeat step 8 for the other
perpendicular bisector.
10. Press ... and select
1:Circle
11. Define the center point of the circle
by moving the cursor near the
intersection of the perpendicular
bisectors until the message "
" appears and
THIS INTERSECTION
press ¸.
12. To complete construction of the
circle, press the cursor pad B to
expand the circle.
Press the cursor pad (B and D) until
the cursor is near one vertex of the
triangle and the message "
" appears, then press
RADIUS POINT
¸ to complete the circle.
13. Measure the circumference of the
circle by pressing
2ˆ
TI-89:
TI-92 Plus / Voyage™ 200 PLT:
selecting
1:Distance & Length
14. Position the cursor near the circle
until the message " CIRCUMFERENCE
" appears and press
OF THIS CIRCLE
¸.
.
Define the center point.
POINT AT
Complete the circle.
THIS
Measure the circumference.
ˆ and
.
10