Adding Ellipse Layers

Graph of an ellipse on a coordinate plane. The ellipse is centered at the origin (0, 0). The x-axis is labeled "X" and goes from -10 to 10. The y-axis is labeled "Y" and goes from -10 to 10.

To add an ellipse to a Cartesian graph:

Insert a Cartesian graph or edit an existing graph by double-clicking it. The Cartesian Graph dialog box opens.
In the Layers section, click Add.
Select Ellipse in the Add Cartesian Layer dialog box and then click OK.
Choose an ellipse type. The ellipse can be centered on the origin or on a different point.
- Choose x2 ⁄ a2 + y2 ⁄ b2 = 1 to center the ellipse on the origin.
- Choose (x - h)2 ⁄ a2 + (y - k)2 ⁄ b2 = 1 to center the ellipse on a point other than the origin.
Enter values for the semimajor axis (a) and the semiminor axis (b).
If the ellipse is not centered on the origin, enter values for the center (h, k).
Select a Line Style for the line.
Select a Line Color.

Select a Relation to specify how shading is applied to the graph.

Relation	Shading
=	The outline of the figure is shaded.
<	The area within the figure is shaded.
<=	The outline and the area within the figure is shaded.
>	The area outside the figure is shaded.
>=	The outline and area outside the figure is shaded.

Click Fill Color to specify the color of the shaded area of the graph.
Click Fill Shading to specify the pattern applied to the shaded area of the graph.
If you want the layer to display only if a certain condition is met, enter an equation or a variable that evaluates to true or false into the Show if field. .

Note: When entering variables, enclose the variable name in two opening and two closing number signs (for example, ##var1## = 3). The variable you reference must be defined for the question or the preface associated with the question.
Click OK.