Detailed tutorial on drawing rotating triangles with geometric sketchpad

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1. Use the point tool to draw three points A, B, and C. Select three points, select [Construction] - [Arc through three points], continue to select [Construction] - [Inside Arc] - [Inside Sector].

2. Use the point tool to determine the center of the circle. (When the point is at the center of the circle, the two radii of the sector will be highlighted.) Use the line segment tool to construct a radius OD of the sector. Use the point tool to pick a point on the radius, select this point and the radius, and select [Construction] - [Vertical Line].

3. Use the point tool to pick a point E on the vertical line and construct line segments DE and OE. Select the vertical line, vertical foot and the inside of the fan shape, and press [Ctrl H] to hide them.

4. Select the triangle and copy and paste it twice. Place one at point A and one at point C. Drag the vertices to coincide with the center of the circle. Select point D, point E, and point O, select [Construction] - [Inside the Triangle], and remove the redundant labels.

5. Select point D, select [Construction] - [Operation Button] - [Animation], set the movement direction to forward, the speed to medium speed, OK. Click the [Animation Point] button to see the triangle rotate around the vertex.

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