CONIC SECTIONS Graphing Circles (Page 3 of 9)

The reason the circle looks like an ellipse is because of the distortion caused by a rectangular viewscreen. This can easily be fixed by using the ZOOM ZSquare command.

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

The circle now looks circular, but the gaps at the sides are still present. To correct this problem, we must create a "pixel friendly" window for the circle. On the TI-83/84, the screen measures 95 pixels wide and 63 pixels tall. To create a pixel friendly window, we want Xmax-Xmin to be a multiple of 9.4 and Ymax-Ymin to be a multiple of 6.2.
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