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N O T E
Geometry
4. Tap
, choose Curves and then the curve whose
area you are interested in.
The name of the object is placed between the
parentheses.
You could have entered the command and object name
manually, that is, without choosing them from menus. If
you enter object names manually, remember that the
name of the object in Plot view must be given a "G"
prefix if it is used in any calculation. Thus the circle
named C in Plot view must be referred to as GC in
Numeric view and Symbolic view.
E
5. Press
6. Tap
.
7. Enter radius(GC) and
tap
. The radius is
displayed.
Note that the syntax
used here is the same as
you use in the CAS to
calculate the properties
of geometric objects.
The Geometry functions and their syntax are described
in "Geometry functions and commands" on page 151.
8. Press
P
to go back to Plot view. Now manipulate the
circle is some way that changes its area and radius. For
example, select the center point (A) and use the cursor
keys to move it to a new location. (Remember to press
E
when you have finished.)
9. Press
M
to go back to Numeric view. Notice that the
area and radius calculations have been automatically
updated.
If an entry in Numeric view is too long for the screen, you can
press
>
to scroll the rest of the entry into view. Press
scroll back to the original view.
or tap
. The area is displayed.
<
to
139
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