TI-89 / TI-92 Plus / Voyage™ 200 PLT Cabri Geometry App 49
The
Calculate
tool opens a calculation entry line near the bottom of
the screen. The entry line is the interface for entering mathematical
expressions involving geometric objects. This tool lets you do the
following:
¦
Perform calculations on constructed objects.
¦
Access various features of the TI
-
89 / TI-92 Plus /
Voyage™ 200 PLT:.
Follow the steps below to perform calculations using measurements,
numerical values, calculation results, and numerical inputs from the
keyboard.
1.
Construct a polygon, and then
measure the distance between each
point (see page 46).
Construct and measure an
object.
2.
To calculate the perimeter, press
TI-89:
2ˆ
TI-92 Plus / Voyage 200 PLT:
ˆ
and select
6:Calculate
.
3.
Press
C
to select the first
measurement then press
¸
.
4.
Press
«
.
5.
Press
C
as necessary to select the
second, third, and fourth measure-
ments, then press
¸
each time.
(Press
«
before each variable.)
Assign variables.
6.
With the cursor in the entry line,
press
¸
.
The sum is calculated and displayed
after
R:
.
Perform the calculation.
7.
To see interactive calculations, grab
a vertex of the polygon and drag it to
another location.
Observe the dynamic changes in the
result (
R:
) as the object is changed.
Observe interactive
calculations.
Performing Calculations
The
Measurement
toolbar menu contains the
Calculate
tool that
performs measurement calculations on your constructions.
Performing
Calculations on
Constructed
Objects
Note
: The result of a
calculation must be a single
floating-point number to be
displayed.
Note:
The characters
assigned to each value are
copied from the drawing
window and indicate that the
value is a variable. The
characters are an internal
variable representation and
do not affect other system-
level variables with the
same name. You can have
up to 10 variables per
calculation.
Note:
You can recall a
calculation by selecting the
result and pressing
2
¸
.
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