trigonometry trig rules including the sine and cosine rules 1.5 / 5 based on 4 ratings ? MathematicsTrigonometryGCSEAll boards Created by: pippaCreated on: 29-05-12 13:42 right angled triangles Rememeber: for all right angled triangles you must use soh cah toa 1 of 6 soh rule soh is opposite over hypotensue = sin if you are trying to find sin rememeber to use the shift button and then the sin button to gain the angle 2 of 6 cah rule cos is adjacent over hypotunese = cos if you are trying to get the angle rememeber to use the shift button then the cos button on your calculator 3 of 6 toa rule tan is opposite over adjcent = tan if you are trying to find the angle press shift then the tan button on your calculator 4 of 6 the sine rule use if : you have 2 sides and 1 angle and trying to find an angle you have 1 side and 2 angles and trying to find a side the side opposite the angle is a matching pair example: a over sinx = b over siny subsitute in the numbers 5 of 6 the cosine rule you will always have 3 sides and 1 angle when using the cosine rule but one of them will be your unknown the equation to use is: a(squared) = b(squared) + c(squared) - 2bccosA the a and cosA must be opposite to each other. sub in the numbers and if needed rearrange the equation. 6 of 6
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