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anonymous
 one year ago
help please
anonymous
 one year ago
help please

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campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0well you can use the law of cosines to check do you know how to use it..?

jennyrlz
 one year ago
Best ResponseYou've already chosen the best response.0sec let me see what i can remeber :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0im to lazy to draw the abc triangle lol, but that explains the law of cosines well

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0the law of cosines says \[Cos(A) = \frac{b^2 = c^2  a^2}{2bc}\] does that help

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0you have a = 5.3, b = 7 and c = 4... plug them in and post the answer you get

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0oops should read \[\cos(A) = \frac{b^2 + c^2  a^2}{2bc}\]

jennyrlz
 one year ago
Best ResponseYou've already chosen the best response.0ill leave it to him, he knows what he is doing :)

jennyrlz
 one year ago
Best ResponseYou've already chosen the best response.0well why do you think it is true?

jennyrlz
 one year ago
Best ResponseYou've already chosen the best response.0he did the "hard" part the rest is algebra

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0well you need to find the angle measure using the law of cosines to see if its true or not

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0an alternative solution is to google a triangle solver put in the 3 sides and then look at the angles that are calculated

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0which law of cosine should i use

jennyrlz
 one year ago
Best ResponseYou've already chosen the best response.0if only i wouldve thought of this when i was taking precalc...

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0use the one I posted above

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how do i use it....do i sub

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0and look for the measures that match the labels a, b and c

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0a = 5.3 b = 7 and c = 4 like this \[cos(\theta) = \frac{7^2 + 4^2  5.3^2}{2 \times 7 \times 4}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\cos \theta \frac{ 49+1628.09 }{66 }\] thats what i have so far

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0well I think the denominator is 56

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0not yet, if you do the calculation you'll find \[\cos(\theta) = 0.659107\] so to find the angle, using a calculator its \[\theta = \cos^{1}(0.659107)\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i got 0.79053943 ? how do i punch this equation in a calculator
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