8-2-12

Drawing Figures

STo 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.

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