Point A moves on the fixed circle o1 .

C is the projection of A on the fixed line o2.

B is the projection of C on the diameter defined by the points O and A.

b is the curve representing the geometric locus of B.

- Switch to the pick-move tool (CTRL+2).

- Pick point A and move it along o1. You see point B tracing exactly the path b.

- Switch to the selection tool (CTRL+1).

- Catch and modify the circle o1 or the line o2. You see b changing dynamically.

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