How can I get decimal answers on my TI-89 calculator when using pi?

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SUMMARY

The TI-89 calculator can be configured to provide decimal answers when performing calculations involving pi. Users can switch between exact and decimal modes by accessing the settings menu. To obtain a decimal result for expressions like 2*pi, pressing the green button (the one with the dot) will yield the desired decimal output if in exact mode. Alternatively, entering expressions in the form of 2(pi)x1.0 can also produce decimal results.

PREREQUISITES
  • Familiarity with TI-89 calculator functions
  • Understanding of calculator modes (exact vs. decimal)
  • Basic knowledge of mathematical expressions involving pi
  • Ability to navigate calculator settings and manuals
NEXT STEPS
  • Research how to navigate the TI-89 settings menu for mode adjustments
  • Learn about the functionality of the green button on the TI-89
  • Explore the TI-89 manual for detailed explanations of modes and settings
  • Investigate alternative methods for obtaining decimal results in other calculators
USEFUL FOR

Students, educators, and anyone using the TI-89 calculator for mathematical computations who need to understand how to obtain decimal answers for expressions involving pi.

Ryuk1990
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This is not necessarily a math question, but I have a problem with a TI-89 calculator. Calculating something with pi doesn't give me a decimal answer. For example, if I put in 2*pi, it will just give an answer of 2pi instead of 6.28. How do I fix this?
 
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It frequently does that sort of thing, preferring things like 3/5, for example. Unfortunately I have been told not to just give away answers, so I can only say that you have to study the manual. One reason the calculator does that is to avoid the error of round off.

However, besides a certain button, just like with PARI--a free download--you can sometimes get around such things by writing 2(pi)x1.0, and trying that.
 
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Two solutions as far as I can remember. I think there is a setting in modes for decimal or exact and settings, you could switch that.

Or if you press the green button (the one with the dot) it will give answers in decimal if you are in exact mode, and exact answers if you are in decimal mode.
 

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