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lilg132
 3 years ago
trigonometry help
lilg132
 3 years ago
trigonometry help

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lilg132
 3 years ago
Best ResponseYou've already chosen the best response.0i need to work out the length of BC and the phi angle

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

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

lilg132
 3 years ago
Best ResponseYou've already chosen the best response.0i've been taught just to do (bc)^2 = ac^2 + ab^2

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

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

lilg132
 3 years ago
Best ResponseYou've already chosen the best response.0i thought i was doing something wrong :p

lilg132
 3 years ago
Best ResponseYou've already chosen the best response.0let me try and do it now thanks for pointing that out
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