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Given: A line L with a point P on it.

Goal: To draw a line through P that is perpendicular to L

Tools: You have a straightedge on which you can mark distances. Thus you can transfer distances from one line to another. And you can make a point anywhere.

Source: David Gale: Tracking the Automatic Ant, Springer, p. 72.

## Cute Factoid

Who is the holder of the U.S. Intercollegiate record in the standing broad jump (which has not been contested for about half a century)?

Answer: Edgar Allen Pow (Thanks to Charles Norman (Macalester) for this one!)

© Copyright 1998 Stan Wagon. Reproduced with permission.

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2 October 1998