Annotated Ideal Harmonic Transformer Math Manipulative

Treat yourself and your classroom to a machine that shows you how Sine and Cosine relate to angles. There is an animation on my blog: http://swampcastle.blogspot.com/2013/11/harmonic-transformer-for-classroom.html

I have also imported and assembled the models into OnShape, where you can take it for a virtual spin. Try it out; you won't be disappointed.

About Onshape: http://swampcastle.blogspot.com/2015/08/onshape-shapes-up-great.html
Link to the model: https://cad.onshape.com/documents/5c003295166a40c699e9ca02/w/8ec0747e1c854c81bd8468e9/e/b660adf4fde44b19baf860fa

How to use:
Use the knob to rotate the arm to an angle. Read the value on the Sine and Cosine scales. Sine and Cosine values are given for a circle with a radius of 1, which is also called a "unit" circle. To obtain lengths for a circle with a radius other than one, multiply the reading from the machine by the desired radius.

Sine and cosine are trigonometric functions of an angle, defined by using right tri