BC = a, AC = b and AB = c Area of triangle is denoted by Δ and the radius of the circumcircle by R. Sine Rule : Cosine Rule : Projection Formulae : a = b cos C + c cos B b = c cos A + a cos C c = a cos B + b cos A Tangent Rule : Half Angle: Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website

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