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Numeric view
Numeric view (
M
) enables you to do calculations in the Geometry app. The
results displayed are dynamic—if you manipulate an object in Plot view, any calculations in
Numeric view that refer to that object are automatically updated to reflect the new properties of the
manipulated object. To continue our example, if you go to Numeric view and tap
, you can
enter an equation to calculate the area of the first circle we created. The syntax is the same as in
the CAS:
area(GC)
. On pressing
E
, the area is calculated and displayed (as shown at the
right). If you go back to Plot view and change the size of circle, you will find that, on returning to
Numeric view, the area shown is now the area of the modified circle. Other calculations pertaining
to that circle—such as the radius—will also have changed.
When you tap
or
in Numeric view, two additional menu items appear:
and
. The
menu gives you access to the syntax of numerous common geometric
measurements and tests (to save you entering them by hand) and the
menu gives you a
selectable list of all the geometric objects currently in Plot view.
Any calculation that you select—by highlighting it and pressing
—will also be displayed in
Plot view. A highlighted calculation can also be edited, deleted, and moved up and down the
calculation list. (The latter option is useful if you have calculations that are dependent on other
calculations.)
Plot Setup view
In addition to the
X Rng
,
Y Rng
,
Axes
and
Labels
options common to a
number of plotting apps, the Plot Setup view in the Geometry app offers:
•
Function Labels
: select this option to have the definition of any plot appear beside the plot
in Plot view
•
Shortcuts
: select this option to enable keyboard shortcuts. For example,
j
selects the line-
drawing tool,
n
selects the triangle drawing tool, and
t
reverses your last operation
(acting as an Undo key). All the shortcuts are listed in the
User Guide
.
