Graphical and textual operation methods for drawing fixed-value line segments on the geometric sketchpad

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If the value has a unit, you can follow the following steps:

When executing the [Data]-[New Parameter] command, if the first step is 15 cm, you must first create a new parameter. A parameter with units. Enter the value in the pop-up dialog box, click in front of [Distance] below, and click [OK] (as shown in the picture), thus creating a new parameter.

Step 2 Draw points to translate. Select [Point Tool] on the left toolbar, draw a point A on the drawing board, select the point, execute the [Transform] - [Translate] command, then click the mouse on the newly created parameter, set the angle to zero, and then click [Translate] , you can get the other endpoint B of the line segment.

Step 3 Draw a constant value line segment. Select the [Line Segment Tool] on the left toolbar, click points A and B in sequence, and draw a line segment, that is, a line segment with a value of 15 cm.

If there is no unit, you can follow the following steps:

Step 1 Draw a line segment with a value of 10. First, create a new parameter t without units and mark the parameter. Execute the [Data]-[New Parameter] command, enter the value 10 in the pop-up dialog box, select [None] for the unit, and click OK. Select the new parameter t and execute the [Transform→Mark Ratio] command.

Step 2 Select the [Line Segment Tool] and draw any line segment on the drawing board as the unit length, that is, how long 1 is. Then double-click any endpoint of the line segment as the center, then select the other endpoint, execute the [Transform]-[Scale] command, then click the parameter t, and click [OK] in the pop-up dialog box, thus finding the other endpoint of the line segment. an endpoint.

Step 3 Draw a constant value line segment. Select the [Line Segment Tool] to connect the two endpoints of the line segment, and you will get a line segment with a value of 10 as shown in the picture. If you don’t want to see the original line segment, you can select it and press [Ctrl H] to hide it.

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