Question about Texas Instruments TI-89 Calculator

When I put my calculator in degrees, it gives me radians measures, and when I put it in radians, it gives me degrees measures. Help please!

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Reset ur calculator. press 2nd 6 F1 3 Enter. Note that all your data will be gone

Posted on Jul 09, 2008

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Posted on Jan 02, 2017

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When the angle unit is in radians
When angle unit is in degrees
sin^-1(0.185)=10.60283581
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In the following screen captures the sine of the values is calculated with the unit specified inside the formula (degree symbol and radian symbol are inserted to show you the unit). In the last calculation the value of the sine is practically 0.184
Remember that when angle is in radians, for very small angles (less than 10 degrees), sin(x) and tan (x) are about equal to the value of the angle in radians

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That is the correct value for the cosine of 60 radians.

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It means your calculator is set to degrees mode. Angles can be measured using three different units: degrees (360 degrees in a circle), radians (2pi radians in a circle), or grads (400 grads in a circle).

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Here is some help
180deg is equivalent to Pi radians
Take some angle. Its measure in degrees is say x_deg, Its measure expressed in radians is x_rad.
The fraction of 180 deg that the angle represents is equal to the fraction of PI that this angle represents.
Conclusion: the ratio x_deg/ 180 deg must be equal to the ratio of x_rad/PI

Isolate X-rad in the above equation. Some will tell you to cross multiply.

Keep the value (525/180) as a fraction reduced to its simplest form. The result is 35/12

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Most likely you do have the calculator in radians (or if you are working in radians, you have it in degrees). Press the mode button, move cruser down to "radians degrees" highlight degrees. and press "2nd quit". things sould be better!

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Hello,
With the TI8x/TI8xPlus you can enter an angle in degrees (Angle mode must be set to degrees) and convert it into DMS representation the following way. Exemple
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To convert 1rad into DMS, takes a little effort but can be done: you have
to convert radians to degrees and the result [ANS] into DMS.

You cannot use an angle written in DMS in any calculation.
But if you want to convert an angle from degrees to radians enter your number and divide by 57.29577951

Hope it helps

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Alot of people seem to be having this problem. Angles can be measured in two units, degrees and radians. Your calculator is currently doing everything in terms of radians. I have an 84 but I'm sure the 83 is similar, go under MODE and look for Degrees and Radians and make sure you choose degrees. if you have to convert, 360[degrees] = 2* pi [radians]
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Good luck

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Press the MODE button to enter the Mode menu, and change the angular measure to suit.

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