For those curious, the law of cosines is also called “Al-Kashi’s law” (in France and the Arab and Persian world). Al Kashi was a Persian mathematician (I encourage you to check his wikipedia page). Great lecture! I was genuinely surprised that what students in Syria are taught in 11th grade, Americans learn in university.. To those from other countries, when did you learn dot product? Just curious####[['lecture', 'Course_General_Feedback', 'POS']]