Reference Angles in Radians

Watch this fun animation of the various radian measurements around a circle. http://mathfour.com/?p=9743 Converting degrees to radians is one thing (multiply by \dfrac{\pi}{180^{\circ}}). But remembering the standard reference angles in radians is a bit more of a challenge.

If you tap into you basic counting nature, it gets easier.

Counting Reference Angles in Radians

I made an animation showing how to “count” reference angles in radians.

Notice the way the angles count around using the numerator of the fraction, while holding the denominator constant:

Watch this fun animation of the various radian measurements around a circle. http://mathfour.com/?p=9743

Can you use it?

How about it? Will you be able to use this to teach reference angles?

Share your thoughts in the comments!



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