anonymous
  • anonymous
need help im going to draw a triangle and im doing the law of sines so if anyone can help please do cuz im confused.. please click this to helpp
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
|dw:1335063015673:dw|
anonymous
  • anonymous
Do you need to find a?
anonymous
  • anonymous
so let me explain im trying to find a okay c=96.3, b=145.67 , B=39.5degrees, C=74.2degrees,

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anonymous
  • anonymous
law of sines is a/sinA=b/sinB
anonymous
  • anonymous
Sine rule says: SinA/a = SinB/b = SinC/c
anonymous
  • anonymous
okay i understand that waitt why is it sina/a instead of a/sin a
anonymous
  • anonymous
SinA/a = Sin(39.5)/145.67 SinA = a*something
anonymous
  • anonymous
Because they mean the same thing. A/B = C/D => B/A = D/C
anonymous
  • anonymous
waitt does it even matter
anonymous
  • anonymous
okay im not understanding
anonymous
  • anonymous
You can find angle A by simply subtracting angles B and C from 180.
anonymous
  • anonymous
okay i understand which would be 66.8
anonymous
  • anonymous
Then, use this: SinA/a = Sin(39.5)/145.67 SinA = a*something SinA/something = a To find a.
anonymous
  • anonymous
SinA/a = SinB/b = SinC/c IS SAME AS a/SinA = b/SinB = c/SinC
anonymous
  • anonymous
but then a would be .00436
anonymous
  • anonymous
I am getting 210.5
anonymous
  • anonymous
That "something" in my expression is 0.00436. Divide Sin66.8 by that "something" value. Then, you get the value of a.
anonymous
  • anonymous
really then let me try again...... im still not getting that are you multiplying or dividing
anonymous
  • anonymous
SinA/a = Sin(39.5)/145.67 SinA = a*0.00436 a = SinA/0.00436 a = Sin66.8/0.00436 a = 210.5
anonymous
  • anonymous
im not getting it first you divided than you did something else im so confused
anonymous
  • anonymous
ok
anonymous
  • anonymous
i also had another question
anonymous
  • anonymous
Post it separately.
anonymous
  • anonymous
i dont understand
anonymous
  • anonymous
Which part don't you understand? :) I can help you.
anonymous
  • anonymous
okay, so instead of 66.8 its 66.3
anonymous
  • anonymous
im so fustrated im confusedd
anonymous
  • anonymous
Punch it into the calculator and you get slightly different number from 210.5
anonymous
  • anonymous
SinA/a = Sin(39.5)/145.67 SinA = a*0.00436 a = SinA/0.00436 a = Sin66.3/0.00436 a = 210
anonymous
  • anonymous
i neeed helpppp
anonymous
  • anonymous
i got -47.99
anonymous
  • anonymous
Check your calculator first. I'm guessing you're getting different answers because your calculator is not in degree mode. That's why it's treating your angles differently.
anonymous
  • anonymous
wait no i got -110.05
anonymous
  • anonymous
How in the world can a length of a side of a triangle be negative? Can you show the arithmetic you used to get that number?
anonymous
  • anonymous
yeppp m ycalculator wasnt in degree mode so let me try again
anonymous
  • anonymous
yayy i got 209.69
anonymous
  • anonymous
Good....close enough to 210. :)
anonymous
  • anonymous
next problem b=58.2 c=68.3 C=51.3 degrees were gunna find a
anonymous
  • anonymous
At this point, it is simply plugging in values into that sine rule ratios and cranking out numbers in a calculator. There is not much help you need.
anonymous
  • anonymous
yeaa but i want to do it my self then have someone do it so i can nn check my answer to make sure its correct
anonymous
  • anonymous
i got 7105. 88
anonymous
  • anonymous
is my answer correct thats all im asking
anonymous
  • anonymous
It can't be that big.
anonymous
  • anonymous
Angles are almost close to each other. So, side lengths have to be close to each other too.
anonymous
  • anonymous
well i must be doing something wrong but sin68.3/51.3=.018111746
anonymous
  • anonymous
128.7/.018111746=7105.88
anonymous
  • anonymous
b=58.2 c=68.3 C=51.3 degrees SinB/b = SinC/c => SinB = 58.2 * Sin(51.3)/68.3 => SinB = 0.665 B = 41.68
anonymous
  • anonymous
becuase i couldnt find A or B so i figured they were the same by suntracting 180-51.3
anonymous
  • anonymous
ohhh ok so u must follow the formula
anonymous
  • anonymous
Now that you know B, you find A by doing 180 - 51.3 - 41.68 = 87
anonymous
  • anonymous
noww i get it
anonymous
  • anonymous
SinA/a = SinC/c => a = c * SinA/SinC => a = 68.3 * Sin(87)/Sin(51.3) => a = 87.4
anonymous
  • anonymous
ok
anonymous
  • anonymous
@dessyk The following variations of Law of Sines are the same: \[\frac{a}{\sin(A)} = \frac{b}{\sin(B)}=\frac{c}{\sin(C)}\] and \[\frac{\sin(A)}{a}=\frac{\sin(B)}{b}=\frac{\sin(C)}{c}\]
anonymous
  • anonymous
He got that. :)
anonymous
  • anonymous
ok :)
anonymous
  • anonymous
hello
anonymous
  • anonymous
yeah
anonymous
  • anonymous
i have another question but hoew did you get 41. sometrhing but i got 45.42
anonymous
  • anonymous
You mean for B = 41? I did the inverse sine function on the value 0.665.
anonymous
  • anonymous
yes, ohh reallyy you see im confused now i thought u just i thought u just took .6650*68.3=45.42
anonymous
  • anonymous
Sin(B) = 0.665 => B = inverse sine (0.665). On the calculator, you have to first press 0.665. Then, inv button, then the sin button.
anonymous
  • anonymous
That gives you angle B.
anonymous
  • anonymous
i didnt get that
anonymous
  • anonymous
dessyk.. nice drawing.. :) :)
anonymous
  • anonymous
thank you i guesss lol can yoiu help me!!
anonymous
  • anonymous
what is the question
anonymous
  • anonymous
its up above next problem b=58.2 c=68.3 C=51.3 degrees were gunna find a
anonymous
  • anonymous
law of sines
anonymous
  • anonymous
i didn't see above but u can find it very easily.. the formula is sin a / a = sin b / b = sin c / c or a /sin a = b / sin b = c / sin c use any of them what caters ur problem
anonymous
  • anonymous
okay but when i tried i started to get fustrated because i wasnt getting the righ tanswer
anonymous
  • anonymous
did my answer help u even a bit or not ?
anonymous
  • anonymous
a little bit its just that i need help going through the process
anonymous
  • anonymous
|dw:1335070736451:dw|
anonymous
  • anonymous
|dw:1335070848159:dw|
anonymous
  • anonymous
get it?

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