Formula Tips 0.0 / 5 ? MathematicsTrigonometryGCSEAll boards Created by: 24122002Created on: 10-11-18 11:41 Area Triangle Rule Area = 1/2absin(c) 1 of 8 Sine Triangle Rule a / Sin A = b / Sin B = c / Sin C For Example: b / Sin B = c / Sin C 15 / Sin (70) = c / Sin(83) c = 15 / Sin(70) x Sin(83) c = 15.84 2 of 8 Cosine Rule a (squared) = b (squared) + c (squared) - 2bc CosA For Example: a (squared) = 5 (squared) + 8 (squared) - 2 x 5 x 8 x Cos(120) = 129 a = 129 (square rooted) = 11.35 = 11.35cm 3 of 8 Letter key CAPITAL LETTERS = Angles lower case = Length LETTERS ARE INTERCHANGABLE !!! 4 of 8 SOHCAHTOA O = SINE S H A = COSINE C H O = TANGENT T A 5 of 8 Sine Pairs Sin (30) = 1 / 2 Sin(45) = 2 (squared rooted) / 2 Sin (60) = 3 (squared rooted) / 2 Sin(90) = 1 6 of 8 Cosine Pairs Cos(30) = 3 (square rooted) / 2 Cos(45) = 2 (square rooted) / 2 Cos(60) = 1/2 Cos(90) = 0 7 of 8 Tangent Pairs Tan(30) = 3 (square rooted) / 3 Tan(45) = 1 Tan(60) = 3 (Square rooted) Tan(90) = MATHS ERROR 8 of 8

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