A simple operation to change the degree of an angle on the geometric sketchpad

Method 1 Use angle parameters to control

In order to create a new angle parameter a and mark the angle. Open the geometric sketchpad, click the [Data] menu in the upper menu bar, select [Menu] from the pop-up drop-down menu, enter the name a in the pop-up dialog box, the value 30, the unit selection degree, click [OK], and the angle parameters are established. . Select the middle parameter a and execute the [Transform]-[Mark Angle] command.

Draw ∠AOB so that its degree is 30 degrees. Select the [Line Segment Ruler Tool] and draw a line segment OB on the drawing board. Double-click point O, mark it as the center of rotation, select line segment OB and point B, execute the [Transform] - [Rotate] command, and click OK in the pop-up dialog box, thus obtaining ∠AOB.

Change the degree of ∠AOB. Select the angle parameter a and use the [ ] and [-] signs to adjust the size of the parameter. You can adjust the size of ∠AOB. The size of ∠AOB changes with the change of the parameter.

Method 2 Manually change the degree of the angle

Use the [Line Segment Ruler Tool] to draw an arbitrary angle ∠ABC in the geometric sketchpad, and use the [Move Arrow Tool] in sequence Select points A, B, and C and execute the [Measure]-[Angle] command to know the size of the angle.

Use the [Move Arrow Tool] to select point A or point C, and then drag the point on the canvas in the direction of rotation to change the degree of the angle. At the same time, the angle The measurement value of is also changing. Through this, we can know that the degree of the angle is changing.

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