Proof of Law of Cosine Equation I m a g e w i l l b e U p l o a d e d S o o n In the right triangle BAD, by the definition of cosine rule for angle : cos A = AD/c or AD= c cosA Subtracting above

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The law of cosines states that, for a triangle with sides and angles denoted with symbols as illustrated above, a² = b² + c² - 2bc * cos (α) b² = a² + c² - 2ac * cos (β) c² = a² + b² - 2ab * cos (γ) For a right triangle, the angle gamma