Detailed method of creating a high fold animation along the base of an isosceles triangle using Geometric Sketchpad

Having trouble making a high fold animation along the base of an isosceles triangle? PHP editor Zimo has prepared detailed steps for you. If you encounter difficulties, don’t be impatient, follow the editor to solve it below!

The production of folding demonstration consists of pre-folding graphics, post-folding graphics, motion graphics and motion buttons. The specific operations are as follows:

By making the isosceles triangle ABC. Open the geometric sketchpad software, select [Customize Tools] - [Triangle] - [Any Isosceles Triangle], click the mouse on the canvas to determine a vertex of the base of the isosceles triangle, then hold down the Shift key and click at the appropriate location Use the mouse to determine another vertex of the base. Use the [Text Tool] to mark the vertices A, B, and C of the triangle.

2. Construct the height CD on the base AB of the isosceles triangle ABC. Select the point C and the line segment AB, select the [Construction]-[Perpendicular Line] command, use the [Point Tool] to mark the intersection point D of the vertical line and AB, construct the line segment CD, and hide the vertical line.

3. Construct the circumcircle E of the isosceles triangle and make the arc AEB. Select points C, A, and B in sequence, select [Construction]-[Angle Bisector], and the angle bisector of angle CAB intersects with high CD and point E. Construct the line segment AE and hide the angle bisector. Select point E and line segment AE, select [Construction] - [Draw a circle with center and radius] to get circle E. Select points E, A, and B in sequence, select [Construction] - [Arc on Circle] to get arc AEB.

4. Make action buttons. Pick any point P on arc AEB and connect PC and PD. Select points P and A, execute [Edit]-[Operation Button]-[Move], and change the button label to [Collapse]; similarly select points P and B, execute [Edit]-[Operation Button]-[Move] ], change the button label to [Restore]. Select two operation buttons, execute [Edit]-[Operation Button]-[Series], change the button label to [Collapse Triangle], and select to execute in sequence.

5. Hide unnecessary objects and beautify graphics. The final rendering is as shown below.

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