Students are taught the "unit circle" and its relationship to trigonometry, but many fail to make the leap on how crucial circles are for trig functions. With static graphs and equations ...

This branch of math, known as trigonometry ... coordinate corresponds to the exact value of the sine function for that angle. In a unit circle, a straight line traveling right from the center ...

In high school, you probably learned that trigonometric functions – like sine ... (These are only the same value in the case of a unit circle!) This is why the square does not trace a straight ...