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Step 1: Create a new geometric sketchpad file. Draw a triangle ABC, and draw an arbitrary vertical line segment DE outside the triangle.

Step 2: Select the "Move Arrow Tool", select point E and point D, and select the menu "Transform" - "Mark Vector" command. Label the line segment ED as the translation vector.

Step 3: Select point A, point B, point C, line segment AB, line segment AC, and line segment BC, and select the menu "Transform"-"Translate" command. Click the "Translate" button in the pop-up dialog box to get the graph as shown in the figure.

Step 4: Select the “Line Segment Tool” and draw line segments AA’, BB’, and CC’.

Step 5: Select line segment AA’, line segment AB, and line segment AC, select the menu "Display" - "Line Type" - "Dotted Line" command to get the graph as shown in the figure.

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