Sine/Cosine Rule-Help!?
I have my calculator Maths GCSE exam tomorrow and i am stuck :/ it would be a great help if anyone could please explain to me what the sine rule and cosine rule are. Thank you :)
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In triangle ABC, A is angle A, B is angle B and C is angle C
Also a is side opposite angle A, b is side opposite angle B, and c is side opposite angle C.
Law of sines says: a/sinA = b/SinB = c/sinC
Law of cosines says:
c^2 = a^2 + b^2 -2ab cosC,
b^2 = a^2 + c^2 - 2ac cosB,
a^2 = b^2 + c^2 - 2bc cos A
-Anonymous
Also a is side opposite angle A, b is side opposite angle B, and c is side opposite angle C.
Law of sines says: a/sinA = b/SinB = c/sinC
Law of cosines says:
c^2 = a^2 + b^2 -2ab cosC,
b^2 = a^2 + c^2 - 2ac cosB,
a^2 = b^2 + c^2 - 2bc cos A
Check out this website... I found it helpful. It basically tells you that for sine, it is a/sineA= b/sineB=c/sineC....... and for cosine it is a^2=b^2+c^2- 2bccos(A) (that can also be done with b and c, respectively)
http://www.y-maths.co.uk/trisincosrl.htm
The above website explains it well and shows pictures :) ... good luck on your exam :)
-Anonymous
http://www.y-maths.co.uk/trisincosrl.htm
The above website explains it well and shows pictures :) ... good luck on your exam :)
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