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I must study politics and war that my sons may have liberty to study mathematics and philosophy. My sons ought to study mathematics and philosophy, geography, natural history, naval architecture, navigation, commerce and agriculture in order to give their children a right to study painting, poetry, music, architecture, statuary, tapestry, and porcelain.

Letter to Abigail Adams, May 12, 1780.

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# 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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