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Circumference and Arc Length  Lesson 109
We started today by reviewing what we knew about the definition of circumference and the relationship between the circumference and the diameter of any circle:
We then went over a couple of examples of using this knowledge:
Next, we defined arc length:
We then compared this to arc measure. Note that two arcs can have the same measure, but different lengths.
We then used this information to do the following problems:
And summarized this work with the following theorem:
Before reviewing homework, we went through the following "cool" example:
The first challenge here was to get the correct diagram:
Once we had that, we were OK...just use Theorem 98 and algebra!
