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Excuse me, how to design the circumference of a circle with the geometric sketchpad, that is, to be able to scroll once and then return to the origin, what are the steps?
1, draw a ray OA.

2. The endpoint o of the ray is the vertical line of the ray.

3. Draw a point B on the vertical line, intersect with B, and make a parallel line BD of OA.

4. Measure the OB distance and calculate the value of 2×OB distance× π.

5. Select point O, and "Transform"-"Translation"-horizontally translate the distance in step 4 by 0 degrees, and change the label of the new point to C.

6. Construct the line segment OC so that the vertical line of OA passes through C and the angle BD is in F..

7. Draw a point P on the line segment BF, and draw a circle with P as the center and OB as the radius.

Hide unnecessary lines and finish.

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