Covered in AA SL, AA HL and AI HL, radian measure is introduced as an alternative to degrees and the conversion between the two systems is established. Students calculate arc length and sector area using radians and work with exact multiples of π. In AA this content appears at SL and underpins the remainder of the trigonometry topic; in AI it is an HL extension, with AI SL students working exclusively in degrees throughout.
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Video lessons
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