Texas Instruments TI-89 User Manual page 66

Adding Descriptive Information to Objects
Moving and
Modifying a Number
I
Note: The cursor is placed
at the right of the least-
significant digit.
Tip: Point to a label,
comment, or numerical edit
value and press ¸ twice
to open the appropriate tool
automatically.
Creating a Marked
Angle
TI-89 / TI-92 Plus / Voyage™ 200 PLT Cabri Geometry App
You can move a number by selecting it and dragging it anywhere in
the plane with the Pointer
edit box is active.
1. Select the number that you want to
change.
2. Press 0 to delete the necessary
digits then re-type the corrected
number.
3. Press ¥C or ¥D to increase or
decrease the digit to the left or right
of the cursor, respectively.
4. Press N when finished.
The tool labels an angle specified by three points with an
Mark Angle
angle mark.
1. Create a triangle as shown in this
example.
2. Press
2‰
TI-89:
TI-92 Plus / Voyage™ 200 PLT:
and select
7:Mark Angle
3. Specify the angle by selecting three
points. The second point that you
select becomes the vertex.
4. Press
2ˆ
TI-89:
TI-92 Plus / Voyage 200 PLT:
and select 3:Angle then select the
marked angle.
5. To measure the exterior angle, drag
the angle mark through the vertex of
the angle.
(continued)
tool. You can modify a number when the
Select a number to modify.
Edit the number with delete
and replace.
Edit the number with ¥C.
‰
.
Select three points.
Measure a marked angle.
ˆ
Measure the exterior angle.
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