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How to copy a line segment with a collapsing compass?

Given any line segment BC, how to copy it with point A as the starting point with straight-edge and collapsing compass? [Hint: a) Consider the easiest situation: the original segment and the copied one are on the same line b) Try to move point C to vary the length of the BC, and move point A to vary the distance between A and B. How to relate those lengths together? c) How about the length of BC > distance between A and B? Vice versa?]