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lilg132Best ResponseYou've already chosen the best response.0
i need to work out the length of BC and the phi angle
 2 years ago

MertsjBest ResponseYou've already chosen the best response.1
Law of Cosines: c^2=5^2+8622(5)(8)cos 115.
 2 years ago

MertsjBest ResponseYou've already chosen the best response.1
\[(BC)^2=5^2+8^22\times5\times8\cos 115\]
 2 years ago

lilg132Best ResponseYou've already chosen the best response.0
i've been taught just to do (bc)^2 = ac^2 + ab^2
 2 years ago

MertsjBest ResponseYou've already chosen the best response.1
then after you find BC use the law of sines.\[\frac{\sin 115}{BC}=\frac{\sin \theta}{5}\]
 2 years ago

MertsjBest ResponseYou've already chosen the best response.1
this is not a right triangle so the pythagorean theorem does not apply.
 2 years ago

lilg132Best ResponseYou've already chosen the best response.0
i thought i was doing something wrong :p
 2 years ago

lilg132Best ResponseYou've already chosen the best response.0
let me try and do it now thanks for pointing that out
 2 years ago
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