anonymous
  • anonymous
help lease
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
do you know law of cosine?
anonymous
  • anonymous
no i dont :{

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anonymous
  • anonymous
wait what
welshfella
  • welshfella
i'm trying to use the equation editor but failing...
welshfella
  • welshfella
the cosine rule when applied here is 2^2 = 3^2 + 4^2 - 2.3.4 cos theta
welshfella
  • welshfella
so you now need to solve for 2.3.4 cos theta
anonymous
  • anonymous
how
welshfella
  • welshfella
well use the rules of algebra
welshfella
  • welshfella
subtract 3^2 + 4^2 from both sides then multiply through by -1
anonymous
  • anonymous
-24 ?
welshfella
  • welshfella
2^2 - 3^2 - 4^2 = 3^2 + 4^2 - 3^2 - 4^2 - 2.3.4 cos theta so the 3^2 and 4^2 disappear from the right side
welshfella
  • welshfella
can you continue? No its not -24
anonymous
  • anonymous
oh wait is it 21
welshfella
  • welshfella
yea
welshfella
  • welshfella
-21 = - 2.3.4 cos theta multiply both sides by -1 21 = 2.3.4 cos theta
anonymous
  • anonymous
k thanx
welshfella
  • welshfella
yw
welshfella
  • welshfella
the cosine rule is used if you know 2sides of a triangle and included angle or 3 sides and you require on of the angles. It can be applied to all triangles.
welshfella
  • welshfella
|dw:1435914229839:dw|
welshfella
  • welshfella
c^2 = a^2 + b^2 - 2ab cos C
anonymous
  • anonymous
oh i see thnx..again
welshfella
  • welshfella
no probs

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