Casio fx-CG10 Advanced Operation Manual page 105

Chapter 6: Conic Sections
Sample Solution—Earth's Revolution (continued)
However, the window is not yet squared, so we cannot tell how far removed
from a circle this elliptical path really is. Here the ellipse appears elongated.
Press
calculator will select the appropriate x-range for the square view.
Press
shows the graph with the adjusted X X min: and X X max:
Note: The path seems to be circular now; this is a much better visualization of
how close the Earth's orbit is to a circle.
e. Use the calculator to verify the location of the foci determined in part a. Why
might these answers vary slightly?
With the graph displayed, press
to find the other focus.
(V-Window) , select
twice then (DRAW) to view the graph. The screen below
(SQUARE) then
(G-Solv) and
(Y-BASE) . The
(FOCUS) , press