Radius & diameter from circumference | High School Geometry | High School Math | Khan Academy
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Sal finds the radius and diameter of a circle given the circumference.
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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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