23-06-2017
Mathematics

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Suppose a triangle has sides a, b, and c, and let theta be the angle opposite the side length a. If cos theta < a, what must be true?

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RickyChen RickyChen

23-06-2017

Cosine rule: a^2 = b^2 + c^2 - 2bc cos A
-> a^2 > b^2 + c^2 - 2bca
-> abc > (b^2 + c^2 - a^2) /2

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