My students found this very challenging. In this section we are looking at the area of 3 types of sections of a circle: a sector, an anulus, and a segment.
In the book they explain how to find the areas of these and I think that these were confusing to my students. As I think about this more I believe that the concept of how to find areas is more important then the formulas.
For the area of a sector a complicated formula is presented, and I think that the best way to think about this is by comparing fractions.
partial degrees / 360 = partial area / total area
This will help understand the idea of comparing proportional parts. The degrees are proportional to the area. This concept is very useful, and could be used for a wide variety of problems, I think this alone might deserve a full day in the future.
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