8.5: Angles of Chords, Secants, and Tangents
Now, we put together what we have learned to calculate more advanced trigonometric ratios. First, we need to study the meaning of chords, or line segments that exist within a circle.
Read this article and watch the video. Pay attention to the examples of how to determine the lengths of chords and their angles. It may help to write down the four chord theorems to help you keep track of them as you work through the problems.
Once you feel comfortable with the definition of chords and their theorems, read this article which details several ways we can calculate the angles formed by chords. Since this page has so much information, read slowly and take time to work through each example. It may be helpful to write down the many theorems to make sure you understand them.
Then, complete review questions 1–10 and check your answers.