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Topic:  whiteboard compass 
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Subject:  RE: whiteboard compass 
Author:  Mathman 
Date:  May 6 2005 
> I keep a nice piece of string with a little loop tied in one end and
> several knots tied along the length. I take it out, say, "Here's my
> compass," and draw a circle. It works great and it conveys the
> essence of a compass to students.
A small point please: The instrument is a "compasses", not the round thing with
a magnet. This is like the other one, "a scissors."
Teaching math, particularly geometry which I like particularly, it became quite
natural to draw a circle freehand with little noticeable variation. That was on
the blackboard though. Do students do basic constructions now? That is a first
effort at application, and embeds some important ideas such as congruence.
David.
 
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