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anonymous
 one year ago
Trig Sine and Cosine Law
Am I correct? Please do not give answer but guide me. Thank you.
Ok, I have a triangle with A= 60 degrees and two sides which are b = 12 and c = 17
Ok, this to me is a Side Angle Side problem SAS, which requires the Cosine Law.
Ok to solve for \( a^2 \) we would use
\( a^2 = b^2+c^2 2\times b \times c \times cos A \) which would be
\( a^2 = 12^2+17^2 2\times 12 \times 17 \times cos 60 \) which will equal \( a = \sqrt{229}\)
Ok, I have more to come but is that correct so far???
anonymous
 one year ago
Trig Sine and Cosine Law Am I correct? Please do not give answer but guide me. Thank you. Ok, I have a triangle with A= 60 degrees and two sides which are b = 12 and c = 17 Ok, this to me is a Side Angle Side problem SAS, which requires the Cosine Law. Ok to solve for \( a^2 \) we would use \( a^2 = b^2+c^2 2\times b \times c \times cos A \) which would be \( a^2 = 12^2+17^2 2\times 12 \times 17 \times cos 60 \) which will equal \( a = \sqrt{229}\) Ok, I have more to come but is that correct so far???

This Question is Closed

AbdullahM
 one year ago
Best ResponseYou've already chosen the best response.0Splendid work so far!

AbdullahM
 one year ago
Best ResponseYou've already chosen the best response.0You are on the correct path :) Now we have to use Law of Sines to calculate the rest.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok now when I use \( cos B = \frac{\sqrt{229}^2+17^2}{2\times \sqrt{229}^2 \times 17} \) I get an error on my calculator....

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Why can't I find B like the following

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Do we have to use Sine Law to find the rest. Why can't we use Cosine Law like the above?? My calculator errors out.

AbdullahM
 one year ago
Best ResponseYou've already chosen the best response.0Using the Sin Law would be more easier :)

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1You apply cos b formula wrong

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0But Cosine should work correct?but my two calculators give errors

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1\(b^2 = a^2+c^2 2ac cosb\\2ac cosb= a^2+c^2 b^2\\cosb=\dfrac{a^2+c^2b^2}{2ac}\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ah crap Loser66 you are right lol I forgot the b^2 Man I thought I was losing my mind. I was like it should work LOL

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Still getting an error. Grrrrr lol

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1why? what do you hit on your calculator? , You need \(\angle b\) right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Going to try my Ti nspire cx Still getting error on my Casio fx 115

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1My calculator said that b is \(\approx 41^0\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Crap, I see where I made my mistake. I need to slow down. I hite times instead of plus

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I got 43.37 degreess

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1hihihi... now, do it together: a^2 +c^2 b^2 = 299 +17^2 12^2 =444 ok?

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1now divided by (2*17*sqrt (299) , we get 0.7552112641 ok?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Cool, thanks Loser66 and AbdullahM, Sending you both 5 owlbucks. Thanks for the help

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1now hit "2nd + cos^1" then type 0.7552112641 it gives us 40.97463023

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1hihihi... that's what my calculator said.

AbdullahM
 one year ago
Best ResponseYou've already chosen the best response.0Just to make sure, we can plug it into a calculator.

AbdullahM
 one year ago
Best ResponseYou've already chosen the best response.0http://www.mathwarehouse.com/trianglecalculator/online.php?&sb=12&sc=17&aa=60#triangleAppData

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1sorry for correcting you again \(a=\sqrt{299}= 17.29\) not 15.13.. as you stated

AbdullahM
 one year ago
Best ResponseYou've already chosen the best response.0Her number is \(\bf 229\) not 299.

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1oh yeah. my bad. I was wrong.
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