8-2-16

Drawing Figures

STo draw a parabola

Note

A parabola is the locus of points equidistant from a point (the focus) and a line (the directrix). A parabola drawn using the [Parabola] command is drawn in accordance with this definition. When you draw an parabola with the [Parabola] command, you need to specify three different points: a line to define the directrix (Point 1 and Point 2) and one point for the focus.

Point 1 .............

A

Point 2 .............

B

Point 3 .............

C

(1)Tap [Draw] and then [Parabola].

This highlights the parabola button on the toolbar.

(2)On the screen, tap the two points that you want to specify the directrix (Point 1 and Point 2).

This causes a line to appear between Point 1 and Point 2.

(3)Tap the point you want to specify as Point 3.

This specifies the point you tap as Point 3 and draws a parabola in relation to it and the directrix.

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