section_path: Trigonometric ratios/The unit circle and common trigonometric values
section_name: The unit circle and common trigonometric values
paragraph_text: The unit circle and common trigonometric values
  
  Trigonometric ratios can also be represented using the unit circle, which is the circle of radius 1 centered at the origin in the plane. In this setting, the terminal side of an angle A placed in standard position will intersect the unit circle in a point (x,y), where x = cos A {\displaystyle x=\cos A} and y = sin A {\displaystyle y=\sin A}. This representation allows for the calculation of commonly found trigonometric values, such as those in the following table: