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Sine rule + Cosine rule
23/09/2023
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SINE RULE For finding sides. a b SinA sinB For finding angles SinA sinB sin C a C a COSINE RULE: B 19 a²=b²+²-2bccOSA b²=a²+c²-2accosB c²=a²+b²-2ab cos C a²1=b²+c²-2bccost 9²= √b²+c²-2bc Cosp BA SinC с a = x ९५ B EXAMPLE 10cm 0 Sin 0 6 75% 22cm 97 A 28cm H Sin (75) 10 6cm Sin 75 10 X 6 = 0.5795 sin (0.58) = 35.42 35.42-0 Label sides write cosine rule Substitute your values Solve C x² = 28² +22²-2(28) (22) cos97° x²=1268-1232 Cos 97° x = √1268-1232 Cos 97° = 37.658... x= 37.66
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