The specific operation process of using angles to control the rotation of triangles in Geometric Sketchpad

1. Draw any triangle ABC in the drawing area.

2. Construct a circle and radius. Construct a circle with center D and draw two points E and F on the circle. Connect the radii DE and DF.

3. Measure the angle and mark it. Select the radius line segments ED, EF and the circle center D, [Measurement] - [Angle]. Double-click point C to mark the center of rotation. Right-click the measured angle value - [Mark Angle].

4. Construct a rotating graphic. Select triangle ABC and select [Transform] - [Rotate]. Drag point F and the triangle will rotate accordingly. At this time the triangle can only be rotated 180 degrees.

5. Rotate graphics 360 degrees. Select [Preset] in the [Edit] menu, change the angle unit to [Direction Degree], and triangle ABC can rotate around point F to achieve 360-degree rotation.

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