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Sine and Cosine Rule revision. PRESS F5. Sine and Cosine Rule revision. PRESS F5 Then spacebar to step through slideshow. Attempt the Q’s – you won’t get anywhere simply viewing someone else doing the maths. If there are two angles involved in the question it’s a Sine rule question. .

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Sine and Cosine Rule revisionPRESS F5Sine and Cosine Rule revisionPRESS F5Then spacebar to step through slideshow.Attempt the Q’s – you won’t get anywhere simply viewing someone else doing the mathsIf there are two angles involved in the question it’s a Sine rule question.62023m7m90520?8mSine ruleUse this version of the rule to find angles:Sin A = Sin B = Sin C a b cUse this version of the rule to find sides:a = b = c .Sin A Sin B Sin Ce.g. 1e.g. 2bAAbCCccaaBBSin A = Sin B = Sin C a b c a = b = c .Sin A Sin B Sin CSin = Sin B = Sin 62 7 b 23 8 = b = ? .Sin 9 Sin B Sin 52Sin = Sin 62 x 7 23 ? = 8 x Sin 52 Sin 9 Sin = 0.2687 = 15.60? = 40.3m If there is only one angle involved (and all 3 sides) it’s a Cosine rule question.Use this version of the rule to find angles: Cos A = b2 + c2 – a2 2bc2.3m2.1m?32cm3.4m67045cmCos A = b2 + c2 – a2 2bcCos = 2.12 + 2.32 – 3.42 2 x 2.1 x 2.3Cos = - 1.86 9.66Cosine ruleUse this version of the rule to find sides: a2 = b2 + c2 – 2bc Cos A Always label the oneangle involved - ACAe.g. 2e.g. 1cbaBbaCABca2 = b2 + c2 – 2bc Cos Aa2 = 322 + 452 – 2 x 32 x 45 x Cos 67a2 = 3049 – 1125.3a = 43.86 cm = 101.10

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