## Trigonometry Tutorial

*Unit Circle*

#### Intro

A unit circle is a circle with the radius of 1. A unit circle has radians, degrees, and coordinates.

#### Sample Problem

#### Solution

It is 0 and 180.

-In a unit circle, 0 and 360 degrees has the coordinate of (1,0); 90 degrees has the coordinate of (0,1); 180 degrees has the coordinate of (-1,0); 270 degrees has the coordinate of (0,1).

-The denominator must be zero and any number that is not zero in the numerator can have the answer to be undefined.

-Tan x is sin x/cos x.

-Cot x is the co-function of tan x, so it is 1/sin x/cos x or cos x/sin x.

# About The Author

Math, Biology, And History Instructor |

Hello. I am Kisung Yoon, and I am a senior in high school. I am currently in the ARISTA Honor Society, and I have tutored my fellow students from my school in Algebra I, Algebra 2, Global History, US History, and Biology. Not only that, I also tutored my younger sisters on the standardized tests mai... |