Construct Lines and Segments in Cabri Jr.

The Cabri Jr. geometry application for the TI-84 Plus calculator offers Create and Construction menus that contain a plethora of tools. With these tools you can do mundane things such as construct lines, segments, triangles, quadrilaterals, and circles.

Because two points determine either a line or a segment, the directions for creating lines and segments are much the same. To construct such objects, follow these steps:

  1. Select the appropriate tool from the F2 menu.

    To do this, press [WINDOW], repeatedly press

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    to highlight the tool you wish to use, and press [ENTER] to select that tool. A pictorial representation of the tool you selected appears in the upper-left corner of the screen.

  2. Use the arrow keys to move the cursor to the location on the screen of the first point that determines your line or segment. Press [ENTER] to anchor this point.

    After you press [ENTER], a flickering point appears on the screen. The point flickers to remind you that you have not yet completed constructing the line or segment.

  3. Use the arrow keys to move the cursor to the location of the second point that determines the line or segment and press [ENTER] to anchor that point, thus completing the construction of the line or segment.

    As you move the cursor, a dotted line or segment appears on the screen. When you press [ENTER], the line or segment appears as a solid line or segment. This indicates that the line or segment has been constructed.

After constructing a line or segment, the tool you were using remains active until you deactivate it. So if you want to construct more objects of the same kind, just repeat Steps 2 and 3. When you are finished using the tool, you deactivate it by pressing [CLEAR] or by selecting another menu item.

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