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Geometry 149
You can change the definition of an object by selecting it,
tapping , and altering one or more of its defining
parameters. The object is modified accordingly in Plot view.
For example, if you selected point GB in the illustration above,
tapped , changed one or both of the point’s
coordinates, and tapped , you would find, on returning
to Plot view, a circle of a different size.
Creating objects You can also create an object in Symbolic view. Tap ,
define the object—for example, point(4,6)—and press
E. The object is created and can be seen in Plot view.
Another example: to draw aline through points P and Q, enter
line(GP,GQ) in Symbolic view and press
E. When
you return to Plot view, you will see a line passing through
points P and Q.
The object-creation
commands available in
Symbolic view can be seen
by tapping . The
syntax for each command is
given in “Geometry
functions and commands”
on page 165.
Re-ordering
entries
You can re-order the entries in Symbolic view. Objects are
drawn in Plot view in the order in which they are defined in
Symbolic view. To change the position of an entry, highlight it
and tap either (to move it down the list) or (to
move it up).
Hiding an object To prevent an object displaying in Plot view, deselect it in
Symbolic view:
1. Highlight the item to be hidden.
2. Tap .
Repeat the procedure to make the object visible again.