Texas Instruments TI-89 Manual Book page 231

Erasing Individual
Parts of a Drawing
Object
Note: These techniques
also erase parts of graphed
functions.
Drawing a Line
Between Two Points
Tip: Use 2 to move the
cursor in larger increments;
2 B , etc.
Drawing a Circle
Tip: Use 2 to move the
cursor in larger increments;
2 B , etc.
214 Chapter 12: Additional Graphing Topics
From the Graph screen:
2 ‰
1.
TI-89:
‰
TI-92 Plus:
and select 2:Eraser.
2. Move the cursor to the applicable location.
To erase:
Area under the box
Along a freehand line
After erasing, you are still in
"eraser" mode.
¦
To continue erasing, move
the box cursor to another
location.
¦
To quit, press N.
From the Graph screen:
2 ‰
1. TI-89:
‰
TI-92 Plus:
and select .
3:Line
2. Move the cursor to the 1st point, and press ¸.
3. Move to the 2nd point, and press ¸. (As you move, a line
extends from the 1st point to the cursor.)
After drawing the line, you are
still in "line" mode.
¦
To continue drawing another
line, move the cursor to a
new 1st point.
¦
To quit, press N.
From the Graph screen:
2 ‰
1.
TI-89:
‰
TI-92 Plus:
and select .
4:Circle
2. Move the cursor to the center
of the circle, and press
¸.
3. Move the cursor to set the
radius, and press ¸.
The cursor is shown as a small box.
Do this:
Press ¸.
Press and hold ¤, and move the
TI-89:
cursor to erase the line.
Press and hold ‚, and move
TI-92 Plus:
the cursor to erase the line.
To quit, release ¤ or ‚.