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[1.16] Use your TI-89/TI-92 Plus as an on-screen ruler and protractor
The program in this tip, called ruler(), lets you measure small objects on the calculator screen. You
must be careful not to damage the screen, but with some care it works fairly well. The program also
shows some useful programming techniques such as automatically identifying the calculator type and
doing some simple graphics. TI Basic is fast enough for this simple interactive program to be usable.
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