The Area of a Triangle using Sine
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From a channel a BrighterTube curator vetted · 80% confidenceFrom a channel Lumen includes in full: Mathispower4u (James Sousa, a maths instructor) has thousands of short worked examples covering arithmetic through calculus, statistics and linear algebra, organised to match course topics.
A 7-minute video from Mathispower4u's catalogue; the title names its topic.
Video by Mathispower4u, played through YouTube's embedded player.
Part of Trig: Triangles and Vectors, Trigonometric Identities, Solving Triangles Using the Law of Sines and Law of Cosines