Maths GCSE Sine and Cosine rules. 3.5 / 5HideShow resource informationMathematicsGCSECreated by: Alice PenningtonCreated on: 05-06-11 09:07 The Sine Rule a = b = c SIN A SIN B SIN C 1 of 3 The Cosine Rule a = b + c - 2bc COS A OR COS A = b + c - a 2bc 2 of 3 Area of a Triangle If you know two sides and the angle between them you can find the area of the triangle using this formula: Area of triangle = 1/2 ab SINC 3 of 3
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