The operation process of modifying the length of line segments on the geometric sketchpad

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Open the geometric sketchpad, click the [Data] menu in the upper menu bar, select the [New Parameter] command in the pop-up drop-down option, enter any value in the pop-up New Parameter dialog box, the unit here must be distance, click Confirm, the newly created parameters as shown in the figure below are created.

Draw points. After creating the new parameters, select [Point Tool] to draw a point A on the drawing board as an endpoint of the line segment.

Construct a circle. Use the move tool to select only point A and the newly created parameters, click the [Construct] menu on the upper menu bar, and select the [Construct a circle with center and radius] command from its drop-down option, and you will get the circle as shown in the figure below.

Use the [Point Tool] to pick any point B on the circle, use the move tool to select points A and B, click the [Construction] menu in the upper menu bar, and select [ Line Segment] command, you will get the line segment AB as shown in the figure below.

Hide the circle. Select circle A and press the shortcut key [Ctrl H] to hide it. At this time, select the parameter and use the [ ] and [-] keys on the keyboard to change the size of the parameter, and the length of the line segment will change.

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