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warpedkitten
 one year ago
In triangle DEF, given the lengths of the sides, find the measure of the stated angle to the nearest degree.
d = 5.4
e = 10.5
f = 10.8;
m<F
warpedkitten
 one year ago
In triangle DEF, given the lengths of the sides, find the measure of the stated angle to the nearest degree. d = 5.4 e = 10.5 f = 10.8; m<F

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jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0dw:1433389914168:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0use the law of cosines to find angle F f^2 = d^2 + e^2  2*d*e*cos(F) 10.8^2 = 5.4^2 + 10.5^2  2*5.4*10.5*cos(F) ... ... ... F = ??

warpedkitten
 one year ago
Best ResponseYou've already chosen the best response.0@jim_thompson5910 I keep using that, however I never get a straight answer. I use Mathway and it gives me 116.64=139.41113.4cos(F) and then I'm not sure what to do with it.

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0Let z = cos(F) for now. If we replace cos(F) with z, we get this equation 10.8^2 = 5.4^2 + 10.5^2  2*5.4*10.5*z are you able to solve for, or isolate, z?
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