Geometric sketchpad demonstrates how to fold triangles in half

1. Use the polygon tool to draw a triangle ABC. Double-click line segment AB, select point C, select [Transform] - [Reflection] to get point C’.

2. Select points A, C’, and C in sequence, and select [Construction]-[Arc on Circle].

3. Use the point tool to pick a point D on the arc, select points D, A, and B, and select [Construction] - [Line Segment] to get the triangle DAB.

4. Select points D and C in turn, select [Edit] - [Operation Buttons] - [Move], change the movement speed to slow, and select [Move to Target final position], labeled [Fold in half], click [OK]. In the same way, select point D and C’ editing operation button, and change the label to [Open].

Drag point A or point B to change the shape and size of the triangle. Click the buttons alternately to dynamically demonstrate the process of opening and folding the triangle.

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