### Learn to Count by Common Radian Units

By Laura Shears

The target audience of this learning object is trigonometry students who have already learned what a radian is and have already derived the key values of the coordinates associated with common radian units, but now need to practice finding those values on the unit circle. The student does not need to know the definition of the six trig functions to do this activity.

During your demonstration/teaching phase you show -1p/6 (for instance) as an angle but dont allow this possibility as an answer in the final quiz. It would be best to show that -1p/2 is written in preferred form as -p/2 during the demonstration and then you can limit quiz answers to preferred form only. Also, to maintain consistency, it would be better to have all fractions written with horizontal fraction bars. You use horizontal around the unit circle nicely but slanted to name the angle above the circle.

Posted by Kathy Krause on 3/27/2006 12:00:00 AM ReplyNote that the advice given by Kathy Krause has been taken, so her suggested improvements have been made to the program. Thanks Kathy!

Posted by Laura Shears on 2/4/2007 12:00:00 AM ReplyVery cool for online class or presenting a lecture. Notice how the color gets a darker shade as you go around the circle more times.

Posted by Susan Halick on 3/28/2006 12:00:00 AM Reply
**Creative Commons Attribution-NonCommercial 4.0 International License.**