Sal introduces arc measure including that they must sum to 360, conventions of minor and major arcs, and a comparison to arc length.

Watch the next lesson: https://www.khanacademy.org/math/high-school-math/math2/math2-circles/math2-arc-measures/v/arc-measure-example-problems?utm_source=YT&utm_medium=Desc&utm_campaign=highschoolmath

Missed the previous lesson? https://www.khanacademy.org/math/high-school-math/math2/math2-circles/math2-circle-basics/v/seeing-circle-similarity-through-translation-and-dilation?utm_source=YT&utm_medium=Desc&utm_campaign=highschoolmath

High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.

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