Discussion:  All Topics 
Topic:  Jeff's Friday ToolFest Question 
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Subject:  LowTech Trig Tools 
Author:  Craig 
Date:  Jun 17 2005 
Patty paper. Easy to fold, easy to trace. With the Quick Circle Generators
I describe below and a protractor, students in my Geometry class were able to
make all sorts of conjectures about arc angles and sectors, inscribed angles,
central angles... they they used logic, reasoning, and brains to prove most of
their conjectures.
Quick Circle Generator (QCG for short), also known as "empty coffee can."
Keep a bunch of different sizes on hand at all times. I use coffee cans very
effectively to teach radian measure and to motivate "radians as the natural
measure" for circular motion. They're also quicker than a compass for producing
a circle (though not as "random" as a compass might be).
 
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