Introduction to Radians (3 of 3: Formal definition & conversion)

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I teach mathematics at a comprehensive public high school in Sydney, Australia. I'm also an author (Woo's Wonderful World of Maths, It's a Numberful World, Eddie Woo's Magical Maths 1 & 2, Whodunnit Eddie Woo?) and TV host (Ultimate Classroom on Channel 10, Teenage Boss on ABC ME). I think learning is awesome, and love being able to share what I've learned with others! More information about me and my work here: http://misterwootube.com/about/