Detailed step-by-step method for moving points on two adjacent line segments using Geometric Sketchpad

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For example, there is a rectangle ABCD and point P is on AD. How to realize the movement of point P from AD to CD? The specific operation is as follows:

You can use the drawing tool to draw the rectangle ABCD. Open the drawing tool, click the [Custom Tools] button on the left sidebar, select [Quadrilateral] - [Rectangle] in the pop-up tool menu, and then draw the rectangle ABCD as shown in the figure on the drawing board.

Pick any point E within the rectangle and construct the interior of any quadrilateral ADCE. Use the [Point Tool] to pick any point E within the rectangle ABCD, select the [Polygon Interior] tool on the left sidebar, and click the points [A, D, C, E, A] in order to construct the interior of the quadrilateral,

Construct points on the boundary. Use the move tool to select the interior of the quadrilateral ADCE, click the [Construction] menu on the upper menu bar, and select the [Point on Boundary] command from its drop-down option to obtain the point P as shown in the figure.

Merge point D and point E. Use the move tool to select point E and point D in sequence, click the [Edit] menu on the upper menu bar, and select the [Merge Points] command from its drop-down option, so that the two points can be merged. At this time, select point P to move, and you will find that point P can move freely on AD and DC.

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