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

© HowStuffWorks 2021 A unit circle is just a circle that has a radius with a length of 1. But often, it comes with some other bells and whistles. A unit circle can be used to define right triangle relationships known as sine, cosine and tangent. These relationships describe how angles and sides of a right triangle relate to one another. Say, for example, we have a right triangle with a 30-degree angle, and whose longest side, or hypotenuse, is a length of 7. We can use our predefined right triangle relationships to figure out the lengths of the triangle's remaining two sides. This branch...