Working with Graphs Zoom Menu (cont.)
ZoomSqr:
This application will redraw the graph by adjusting xmin and
xmax so that the tic marks are equal in distance on both axes.
This is useful when you need to see an accurate shape, such as
a circle.
For example, graph the circle x^2+y^2=25.
• Step 1 Enter in the functions as so:
y1=sqrt(25-x^2) and y2=-sqrt(25- x^2).
• Step 2 Press F2 and then press 6:ZoomStd. This will create an
oval shaped graph.
• Step 3 For a more circular result, go back to the “Y=” screen,
press F2, and then press 5:ZoomSqr.
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