Drawing Figures
uTo 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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