how to know when to use sine rule or cosine rule/C2

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mrdetermination
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#1
Report Thread starter 8 years ago
#1
is their an easy why to identify the rule to use when you are in a c2 exam, as i find know the 4 rules of cosine and sine rule a bit confusing
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the bear
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#2
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if you are not sure just try the sine rule... if it does not work switch to the cosine rule
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TenOfThem
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#3
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(Original post by mrdetermination)
is their an easy why to identify the rule to use when you are in a c2 exam, as i find know the 4 rules of cosine and sine rule a bit confusing
I am trying to imagine what these 4 rules are - do you mean the 2 rules plus their rearrangements to find angles


If so

The Sine Rule is fairly easy to remember
The Cosine Rule is given on the formula sheet
The rearrangement of the Cosine Rule is a GCSE level skill

It really depends on what information you have - if you put the information into a rule and you have everything apart from the value you are meant to be finding then you are using the correct rule
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TenOfThem
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#4
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#4
(Original post by the bear)
if you are not sure just try the sine rule... if it does not work switch to the cosine rule
LoL

Nicely succinct
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