TI-85 Program: Concentric Circles

This is a simple TI-85 program, named CIRCLE, which graphs some concentric circles centered at the origin. Try running it using a few different windows (ones which are centered at the origin) to see how the choice of window distorts the circles. 

PROGRAM:CIRCLE
:ClLCD
:DispG
:FOR(I,1,15,1)
:Circl(0,0,.8*I)
:End

Try replacing the 4th ("FOR...") and 5th ("Circ...") lines of the program by 

:xMax-xMin->xSize
:yMax-yMin->ySize
:xMin+.5*xSize->xCenter
:yMin+.5*ySize->yCenter
:FOR(I,1,15,1)
:Circl(xCenter,yCenter,.04*xSize*I)
to get a program which creates concentric circles centered at the middle of whatever window you are in. Can you see how the program works? 




This document was created in September, 1996 
and last revised on August 15, 1998.

Your questions, comments or suggestions are welcomed. Please direct correspondence to:

Andy Miller
Department of Mathematics
University of Oklahoma
e-mail: amiller@ou.edu

URL: http://www.math.ou.edu/~amiller/ti85/circle.htm