The parabola tool displays a movable parabola on the graph view. (See below:)
Parabola tool cursor:
The parabola tool also displays equations, coordinates and calculated values, and plots the curves, lines and points directly.
Select the parabola tool by clicking the button on the graph tools tool bar, or by selecting the 'Parabola' command from the 'Tools' menu.
A parabola is the path traced out by a point that moves so that it is always the same distance from a fixed line and a fixed point not on the line.
The line is called the 'directrix' of the parabola, and the point is called the 'focus' of the parabola. The parabola tool handles two types of parabolas. The 'y=' type, with horizontal directrix, and the 'x=' type, with vertical directrix. (See diagram below:)
When the parabola tool is selected, the parabola tool dialog box is displayed (See below:).
Press the space bar on the keyboard to plot graphs of:
Changing the shape of the parabola:
With the parabola tool displaying the parabola on the graph view, click and hold the left mouse button while moving the mouse.