Unit Circle – TI-84 Evo Math Program

This program draws the whole unit circle on the calculator screen: every standard angle, labeled in degrees, radians, or exact (x,y) coordinates like √3/2, switchable with the arrow keys.

Send it to your calculator

Plug the calculator into your computer with a USB cable, then use the button below. If something is not working, see troubleshooting.

Open it on the calculator

1. Press the prgm key. The PROGRAMMING menu opens.

   

   

2. Press enter to select TI-Basic. The list of TI-Basic programs opens.

   

3. Press enter on UNITCIRC in the program list, which puts prgmUNITCIRC on the home screen.
4. Press enter to run it. The circle draws with every standard angle labeled in radians, and a small menu sits in the middle with a pointer on Radians.

   

Switch between degrees, radians, and (x,y)

1. Arrow up to Degrees and press enter. The circle relabels in whichever view the pointer is on: Degrees marks every angle from 0° to 330°.

   

2. Select (x,y) for the coordinates. Every point shows its pair as exact values: the first number is the cosine of that angle, the second is the sine, so cos 150° reads straight off the circle as −√3/2.

   

3. Press clear when you're done. The circle closes and you're back on the home screen.

More TI-84 Evo Math Programs

• Radical Simplifier
• Factoring Polynomials
• Distance Formula
• Pythagorean Theorem
• Slope Formula
• Prime Factorization

← All TI-84 Evo math programs