How to create a symmetry point using a line segment as the axis of symmetry in the geometric sketchpad

Draw points and symmetry axes. Open the geometric sketchpad, select the [Point Tool] from the toolbox on the left, and draw a point A arbitrarily in the blank space of the sketchpad; select the [Line Segment Tool], and draw a line segment BC arbitrarily near the point A. The line segment serves as the axis of symmetry and can be in any direction. , does not have to be in a vertical state,

Execute the mark mirror command on the symmetry axis BC. Select the [Move Arrow Tool], click the line segment BC with the mouse to make it selected, click the [Transform] menu above, and select the [Mark Mirror] command from its drop-down menu (as shown in the picture), so that the line segment BC will appear as selected. Marking process.

Reflect point A to get the symmetry point. Select the [Moving Arrow Tool], click point A with the mouse to make it selected, click the [Transform] menu above, and select the [Reflection] command from its drop-down menu, so that the symmetric point A' of point A with respect to line segment BC is obtained. .

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