Tutorial on how to rotate a triangle around its vertices using geometric sketchpad

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For example, a triangle is rotated 90 degrees around one of its vertices.

The detailed operations are as follows:

1. Select [Data] - [New Parameter], set the name to a, set the unit to angle, and the value to 90. Select the parameter and select [Transform] - [Mark Angle].

2. Use the line segment tool to draw an arbitrary triangle. Select three vertices and select [Construction] - [Interior of Triangle].

3. Double-click any vertex of the triangle, then select the entire triangle, select [Transform] - [Rotate], and select [Mark Angle].

4. Select one side of the rotation center and parameter a, select [Edit] - [Operation Button] - [Animation], in the pop-up dialog box, change The value is [continuous], ranging from 0 to 90, and the rest can be set by default. Clicking the animated button triangle will rotate 90 degrees around its vertices.

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