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|dw:1335063015673:dw|

Do you need to find a?

so let me explain im trying to find a okay c=96.3, b=145.67 , B=39.5degrees, C=74.2degrees,

law of sines is a/sinA=b/sinB

Sine rule says:
SinA/a = SinB/b = SinC/c

okay i understand that
waitt why is it sina/a instead of a/sin a

SinA/a = Sin(39.5)/145.67
SinA = a*something

Because they mean the same thing. A/B = C/D => B/A = D/C

waitt does it even matter

okay im not understanding

You can find angle A by simply subtracting angles B and C from 180.

okay i understand which would be 66.8

Then, use this:
SinA/a = Sin(39.5)/145.67
SinA = a*something
SinA/something = a
To find a.

SinA/a = SinB/b = SinC/c
IS SAME AS
a/SinA = b/SinB = c/SinC

but then a would be .00436

I am getting 210.5

really then let me try again...... im still not getting that are you multiplying or dividing

SinA/a = Sin(39.5)/145.67
SinA = a*0.00436
a = SinA/0.00436
a = Sin66.8/0.00436
a = 210.5

im not getting it first you divided than you did something else im so confused

ok

i also had another question

Post it separately.

i dont understand

Which part don't you understand? :) I can help you.

okay, so instead of 66.8 its 66.3

im so fustrated im confusedd

Punch it into the calculator and you get slightly different number from 210.5

SinA/a = Sin(39.5)/145.67
SinA = a*0.00436
a = SinA/0.00436
a = Sin66.3/0.00436
a = 210

i neeed helpppp

i got -47.99

wait no i got -110.05

yeppp m ycalculator wasnt in degree mode so let me try again

yayy i got 209.69

Good....close enough to 210. :)

next problem
b=58.2
c=68.3
C=51.3 degrees
were gunna find a

i got 7105. 88

is my answer correct thats all im asking

It can't be that big.

Angles are almost close to each other. So, side lengths have to be close to each other too.

well i must be doing something wrong but sin68.3/51.3=.018111746

128.7/.018111746=7105.88

becuase i couldnt find A or B so i figured they were the same
by suntracting 180-51.3

ohhh ok so u must follow the formula

Now that you know B, you find A by doing 180 - 51.3 - 41.68 = 87

noww i get it

SinA/a = SinC/c
=> a = c * SinA/SinC
=> a = 68.3 * Sin(87)/Sin(51.3)
=> a = 87.4

ok

He got that. :)

ok :)

hello

yeah

i have another question but hoew did you get 41. sometrhing but i got 45.42

You mean for B = 41? I did the inverse sine function on the value 0.665.

yes, ohh reallyy you see im confused now i thought u just i thought u just took .6650*68.3=45.42

That gives you angle B.

i didnt get that

dessyk.. nice drawing.. :) :)

thank you i guesss lol can yoiu help me!!

what is the question

its up above next problem
b=58.2
c=68.3
C=51.3 degrees
were gunna find a

law of sines

okay but when i tried i started to get fustrated because i wasnt getting the righ tanswer

did my answer help u even a bit or not ?

a little bit its just that i need help going through the process

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get it?