lilg132
  • lilg132
trigonometry help
Mathematics
chestercat
  • chestercat
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lilg132
  • lilg132
|dw:1328053926336:dw|
lilg132
  • lilg132
i need to work out the length of BC and the phi angle
Mertsj
  • Mertsj
Law of Cosines: c^2=5^2+862-2(5)(8)cos 115.

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Mertsj
  • Mertsj
\[(BC)^2=5^2+8^2-2\times5\times8\cos 115\]
lilg132
  • lilg132
i've been taught just to do (bc)^2 = ac^2 + ab^2
Mertsj
  • Mertsj
then after you find BC use the law of sines.\[\frac{\sin 115}{BC}=\frac{\sin \theta}{5}\]
Mertsj
  • Mertsj
this is not a right triangle so the pythagorean theorem does not apply.
lilg132
  • lilg132
ohhh ok
lilg132
  • lilg132
i thought i was doing something wrong :p
lilg132
  • lilg132
let me try and do it now thanks for pointing that out
Mertsj
  • Mertsj
yw

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