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Conics: Graphing Circles




You are watching: How to graph circles on ti 84 plus

A. center at the origin:
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B. center at (h, k):
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example A: Graph:

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Solution: Enter the equation right into Y= by addressing for y.
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get in the optimistic square root into Y1. Get in the an adverse square root into Y2, or go into the negation of Y1. If you choose ZOOM #6 (the typical window), the graph will show up to it is in an ellipse rather than a circle because of the 3/2 facet ratio that the viewing display screen (the conventional viewing screen is no a square). Choose ZOOM#5 ZSquare to develop a viewing window where the systems on both axes space the exact same length.

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NOTE: * you may notice that the "vertical" edge of the graph might not show up in the the town hall window. The viewing display cannot graph points the fall in between pixels.* friend may an alert that the TRACE duty will not move immediately between the two sections that the graph since the hopeful and an unfavorable square roots were graphed together two different equations. The up arrow can be offered to move between the 2 sections of the graph. Also, the cursor will certainly disappear if that is moved past the domain because that which x is defined.



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Example B: Graph:

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Solution: go into the equation right into Y= by fixing for y.
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enter the equation with the hopeful square root right into Y1. Enter the equation v the an unfavorable square root into Y2. Girlfriend cannot just negate Y1 to achieve Y2 in this problem. Choose ZOOM#5 ZSquare to create a viewing home window where the systems on both axes room the same length.

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Solution utilizing DRAW: (please follow steps in order) push ZOOM#4 (ZDecimal) to go to a graphing screen.To graph the circle, press 2nd PRGM (DRAW) #9 Circle.Move the cursor to the "h" value of +2 by utilizing the arrows.Move the cursor come the "k" worth of +1 by using the arrows.Press enter to collection the suggest for the center of the circle.Move the cursor the size of the radius (1) far from the center. Save track that the worths at the bottom that the window.When friend hit ENTER, the circle will be immediately drawn.You might need a larger window if your radius is large. (Zoom Out)

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Tidbit: You deserve to use a "list" approach to deal with the plus and minus square roots:

Graph:

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which becomes
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