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Proof: Radius is perpendicular to tangent line | Mathematics II | High School Math | Khan Academy
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Sal proves that the radius that connects the intersection point of a tangent line with the circle is perpendicular to the tangent line.
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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Proof: Radius is perpendicular to tangent line | Mathematics II | High School Math | Khan Academy
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