Proof: Segments tangent to circle from outside point are congruent | High School Math | Khan Academy

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Sal proves that two tangent segments to a circle that are drawn from the same outside point are congruent.

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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