Dear friends who have just installed Geometry Sketchpad, if you still don’t know how to use the construction trajectory command, please come to the following graphic tutorial to learn how to use the construction trajectory command in Geometry Sketchpad. I hope it can help you.

For example: Set a moving point on a circle and require the midpoint trajectory of the line segment between this point and another point. The specific construction operation is as follows:

Step 1: Construct a circle O and pick a point A on the circle. Open the geometric sketchpad, select the "Circle Tool" on the left sidebar and draw a circle O in the work area. Use the "Point Tool" to pick a point A on the circle, as shown in the figure.

                                                                                                                                                                                                                          Pick a point B and construct a line segment AB. Use the "Point Tool" to draw a point B arbitrarily in the blank area, then select points A and B in sequence, click the "Construction" menu on the upper menu bar, and select the "Line Segment" command from its drop-down option, thus constructing the line segment AB.

Construct the midpoint M of line segment AB. Use the move tool to select line segment AB, click the "Construction" menu on the upper menu bar, and select the "Midpoint" command from its drop-down option, thus obtaining the midpoint M of the line segment.

                                                                                                                                                                                                                                                                    a       Use the move tool to select point A and point M in sequence, click the "Construction" menu on the upper menu bar, and select the "Trajectory" command from its drop-down option, thus obtaining the motion trajectory of midpoint M.

The above article explains the graphic and text operation process of using the construction trajectory command in the geometric sketchpad. I hope that friends in need can learn it.