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Angles Related to a Circle - Lesson 10-5

Today we by reviewing a couple of definitions (angles with vertices on the circle):

We then learned a property of these types of angles:

Next, we defined chord-chord angles (angles with vertices inside the circle):

And learned a property about them:

Here's a hint for how to prove Theorem 86...see if you can do it!

We then defined three more types of angles related to circles (those with their vertices outside of the circle and learned a property about them:

Here's a summary of the information shown above:

We finished by doing the following example and then started on homework: