Key Curriculum Press Geometer's Sketchpad User Manual And Reference Manual Download Page 43

Page: 43 / 92

The Geometer’s Sketchpad

for TI-89, TI-92 Plus, and

Voyage™ 200 PLT User Guide and Reference Manual

Edit:

Undo revokes the most recent action taken in the sketch.

Sketchpad supports unlimited undo; so, by choosing Undo repeatedly, you
may undo your construction, step by step, back to the moment at which
you began work in the sketch. This command is available only after one or
more actions have been taken in a new or newly opened sketch.

Edit:

Redo returns the most recently undone action to the sketch.

Use this command after undoing one or more actions to trace your steps
forward again. This command is unavailable if you haven’t undone an
action, or if, since undoing an action, you have performed some other
action that modifies your sketch.

Unlimited Undo and Visual Explanations

In addition to helping correct mistakes, Sketchpad’s unlimited undo and
redo is well-suited for sharing visual explanations of your work, or to
inspect a construction created by someone else. Choose Undo repeatedly
to return to the beginning of your work. Then choose Redo to proceed one
step at a time through the construction, to explore or explain how the
construction was assembled.

Unlimited Undo and Memory

Because Sketchpad stores all of the actions performed in a sketch, the
Undo history can take up a considerable amount of calculator memory.
Sketchpad refreshes its Undo history whenever you reopen a saved sketch.
To save and reopen a sketch while working on it, thereby refreshing the
Undo history, press

Edit:

Sketch:

Open and then press

to indicate that you do want to save changes before closing. Type the name
of the sketch (either a new name, if this is the first time this sketch has
been saved, or the previously entered name of the sketch) in the Variable
field of the Save As dialog box that appears, and then press

twice.

Navigate the Open dialog box that appears until the name of the just-saved
file is highlighted, and once again press

twice. Do this whenever

you find yourself running low on memory.

Also, as saved sketches use valuable memory, it’s a good idea to
periodically delete sketches you no longer wish to keep. To delete
sketches, use the

2°

menu. To use the

commands, see

Delete vs. Undo (page 87) or consult the guidebook for your handheld
device at education.ti.com/guides.

Edit Menu

The

Edit menu contains commands for changing and

navigating through your sketches, including undoing and
redoing actions, deleting objects, redefining relationships,
selecting objects, reviewing properties, saving and opening
sketches, and creating new sketches. This section explains
how to use Edit menu commands.

Undo

Redo

Not every action is stored in
the Undo history—only
constructions that affect
objects, their creation, or
their location. The text
accompanying the Undo
and Redo commands in the

Edit menu will describe

which action is about to be
undone (or redone).