x, -y
... A quadrilateral can be inscribed in a circle if and only if its opposite angles are supplementary. ...
... A quadrilateral can be inscribed in a circle if and only if its opposite angles are supplementary. ...
Trigonometry Outline
... While we do not have time to prove it here, this relationship holds for all angles (not just those that fall in QI). When using this relationship, the easiest circle to consider would be one with radius r = 1 - the Unit Circle! ...
... While we do not have time to prove it here, this relationship holds for all angles (not just those that fall in QI). When using this relationship, the easiest circle to consider would be one with radius r = 1 - the Unit Circle! ...
![MATH-G Exam [E-1R2V91] BRH-Spencer](http://s1.studyres.com/store/data/017210636_1-51243c909e344197db5beec07b2fcab4-300x300.png)
