Trig challenge problem: area of a triangle | Khan Academy
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From a channel a BrighterTube curator vetted · 80% confidenceFrom a channel Lumen includes in full: Khan Academy's main channel holds thousands of free, standards-aligned lessons across maths, science, economics and the humanities, taught step by step on a digital blackboard by Sal Khan and subject experts.
A 17-minute video from Khan Academy's catalogue; the title names its topic.
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Part of Competition Math, AIME | Math for fun and glory | Khan Academy, Trig identities and examples | Trigonometry | Khan Academy