A unit circle is an important part of trigonometry and can define right angle relationships known as sine, cosine and tangent.

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.

AH HA! You knew trig was really about circles. Alas, not really. It just happens that it's easy to show trig functions with a circle, but trig functions are really about right triangles. Don't be ...

In high school, you probably learned that trigonometric functions – like sine, cosine and tangent –can be derived, geometrically, from a circle (hence why ...

A unit circle is an important part of trigonometry and can define right angle relationships known as sine, cosine and tangent.