Texas Instruments TI-89 Titanium User Manual page 209

TI-89 Titanium
¸ ¸
Reexecuting an entry "as is" is useful for iterative calculations that involve
Note:
variables.
Using the equation
square centimeters.
Editing an entry lets you make minor changes without retyping the entire entry.
Note:
The example below uses 8 as the first guess and then displays the answer in its
approximate floating-point form. You can edit and reexecute using
until the answer is as accurate as you want.
TI-89 Titanium
§ j 2
8 R
Ë
2 T j Z
R 2
¸
8 ¸
Calculator Home Screen
Display
2
, use trial and error to find the radius of a circle that covers 200
A= r
p
Display
and continue
7.95
206