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To draw an ellipse using the [Ellipse] - [Foci] command
Note
An ellipse is the locus of points, the sum of whose distances from two fixed points (called
foci) is a constant. An ellipse drawn using the [Ellipse] - [Foci] command is drawn in
accordance with this definition. When you draw an ellipse with the [Foci] command, you need
to specify three different points: two foci (Point 1 and Point 2) and one point anywhere on the
ellipse (Point 3).
Point 1 .............A
Point 2 .............B
Point 3 .............C
(1) Tap [Draw], [Ellipse], and then [Foci].
• This highlights the ellipse foci button on the toolbar.
(2) On the screen, tap the two points that you want to specify as the foci of the ellipse (Point
1 and Point 2).
• This causes a line to appear between Point 1 and Point 2.
• Instead of tapping two points as described above, you could also specify the two foci
by tapping to define Point 1 and then dragging the stylus across the screen to Point 2.
8-2-12
Drawing Figures
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