Web Resources:

http://zonalandeducation.com/mmts/trigonometryRealms/radianDemo1/RadianDemo1.html
Defines a radian with a great visual and shows its connection to circumference

http://www.youtube.com/watch?v=MV40meqda3o
Defines a radian, shows it’s connection to circumference, shows that 360° = 2p radians and begins to explore some other degree/radian equivalents.

http://www.wisc-online.com/objects/ViewObject.aspx?ID=tmh1301
This is a wonderful interactive explanation of radians used to reinforce what students have just learned about radians.

http://www.mathlearning.net/learningtools/Flash/unitCircle/unitCircle.html
Interactive Unit circle that allows students to rotate the angle and it shows the measure in both degrees and radians (using the exact value for integer multiples of p/6 and p/4). 

http://homepages.ius.edu/mehringe/M126/Supplements/Blank%20Unit%20Circle.htm
Blank unit circle for practice with special angles. 

http://zonalandeducation.com/mmts/trigonometryRealms/CommonAngles1/CommonAngles1.html
Students can click to find the special angles around a unit circle in both degrees and radians.

http://www.wonderquest.com/circle.htm
Brief explanation for 360 degree circle

http://interactagram.com/math/trigonometry/radian/
Defines a radian with another visual and introduces q= s/r.  This is NOT in the webquest, but can be used as an additional resource.

http://www.clarku.edu/~djoyce/trig/angle.html
A brief history and description of where radians came from and why they are used. 

http://www.wisc-online.com/objects/ViewObject.aspx?ID=tmh1301
This is a wonderful interactive explanation of radians that is NOT used in the webquest, but that could be used to support students who may need some additional resources to understand what a radian is.