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A, B and the line connecting them exist before you start the construction, and the author assumes there's no error there. Then to start the construction, you h
by simplicio 3y ago
A, B and the line connecting them exist before you start the construction, and the author assumes there's no error there.
Then to start the construction, you have to put one arm of your compass on the point A, and one on the point B. These points exist and are already marked, but you incur error when you place your compass down on each one. These are the represented by the blue and yellow circles in the diagram.