Van Schooten's Ruler Constructions - Solution to Problem III

Problem III: Through a given point C draw a straight line parallel to a given straight line AB.

Construction: Draw from C through A an indefinitely long straight line and put on it AD equal to AC and from D through B make DBE. In that, place BE equal to BD and join CE. I say that it is parallel to AB.

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Solution to Problem IV

The other eight problems