How to Convert Calculator to Degrees Ti84

Converting your TI-84 calculator to degree mode is essential for accurate angle calculations in geometry, trigonometry, and physics problems. This guide explains the process step-by-step, including how to verify the conversion and troubleshoot common issues.

Why Convert to Degrees

Most real-world angle measurements use degrees, while the TI-84 defaults to radians for trigonometric functions. Converting to degree mode ensures your calculations match standard conventions in:

Geometry problems involving triangles and polygons
Physics applications like projectile motion and circular motion
Engineering drawings and technical measurements
Everyday scenarios involving angles like compass bearings

Note: Radians are more common in calculus and advanced mathematics, but degrees are preferred for most practical applications.

How to Convert Your TI-84

Follow these steps to change your calculator's mode to degrees:

Press the MODE button on your TI-84
Use the arrow keys to navigate to the Angle setting
Press the right arrow key to select Deg (for degrees)
Press ENTER to confirm the selection
Press 2nd then MODE to exit the menu

To verify the conversion, calculate sin(30) in degree mode. The result should be approximately 0.5, matching the known value for 30 degrees.

Once converted, all trigonometric functions (sin, cos, tan) will use degrees as their input units. The calculator will display "Deg" in the top status bar when in degree mode.

Common Angle Conversions

Here are some frequently used angle conversions between degrees and radians:

Degrees	Radians	Common Use
0°	0	Starting point for angles
30°	π/6	Common triangle angle
45°	π/4	Diagonal of a square
60°	π/3	Equilateral triangle angle
90°	π/2	Right angle
180°	π	Straight angle
360°	2π	Full circle

Remember that π radians equals 180°, so to convert degrees to radians, multiply by π/180, and to convert radians to degrees, multiply by 180/π.

Troubleshooting

Calculator Not Showing Degrees

If your TI-84 isn't showing "Deg" in the status bar, verify the mode by:

Pressing MODE and checking the Angle setting
Calculating sin(30) - if it shows 0.5, you're in degree mode
If it shows approximately 0.49999999999999994, you're in radian mode

Incorrect Results After Conversion

If your trigonometric calculations are still incorrect:

Double-check you've selected Deg in the Angle menu
Ensure you're using the correct trigonometric function (sin, cos, tan)
Verify your input values are in degrees

Calculator Resets to Radian Mode

If your calculator keeps reverting to radian mode:

Check for any software updates for your TI-84
Try resetting the calculator to default settings
Consider using the 2nd + MODE shortcut to quickly return to degree mode

FAQ

Can I use both degrees and radians on the TI-84?: Yes, you can switch between modes as needed. The calculator remembers your last selected mode between calculations.
How do I convert between degrees and radians on the TI-84?: Use the conversion formulas: multiply degrees by π/180 to get radians, or multiply radians by 180/π to get degrees.
Why does my TI-84 show different results for the same angle in different modes?: This happens because trigonometric functions use different units. For example, sin(1) in radian mode calculates sin(1 radian), while sin(1) in degree mode calculates sin(1 degree).
Can I set the TI-84 to use grads instead of degrees?: No, the TI-84 only supports degrees and radians as angle units. Grad is not available as an option.
How do I save my preferred angle mode setting?: The TI-84 remembers your last selected angle mode, so you don't need to reconfigure it each time you turn on the calculator.