Discussion:  All Tools in Trigonometry on Sketchpad 
Topic:  Using Sketchpad to illustrate coterminal angles 
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Subject:  RE: Using Sketchpad to illustrate coterminal angles 
Author:  NateB 
Date:  Mar 10 2008 
Here is a trick that my friend Rob Rumppe showed me. Create two points A and B
on a circle with center C. Measure the angle ACB. Now create a measurement and
multiply measure of angle ACB by (for example) 10. Then "mark" the new (bigger)
angle. Now rotate point B by the marked angle around center C. The transformed
(rotated) angle will be able to get around the circle five times as B goes to
pi.
I used this trick (but only to get to 2pi) in a circular trig sketch which can
be found on this site:
http://nateburchell.googlepages.com/index.html
I hope that this helps
Nate Burchell
On Mar 10 2008, Lillian wrote:
> Does anyone know if there's a way to illustrate angles with measures
> greater than 2pi using Sketchpad. I'd love be able to draw a unit
> circle, put a point on the unit circle, animate it, and display the
> radian measure of the arc formed as the point goes around the
> circle, and have it not start over at 0 every time the point goes
> around the circle.
Thanks,
Lillian
 
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