UNIT CIRCLE Circular Functions (Page 5 of 10)

Because the screen on the TI-83/84 is rectangular, the circle looks more like an ellipse. To make the circle appear correctly, we can use the ZOOM ZSquare command that will adjust the window to remove the distortion.

 ZOOM key. 5: menu selection. Calculator screen image.

Now use the TRACE feature to display the coordinates of points on the unit circle. Press the right arrow key repeatedly to advance the cursor counter-clockwise around the circle.

 TRACE key. Right arrow key. ... Calculator screen image.
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