BeccaB003
  • BeccaB003
Help with lengths. Thanks!
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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BeccaB003
  • BeccaB003
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Nnesha
  • Nnesha
\[\rm sin \rm \theta = \frac{ opposite }{ hypotenuse }~~~~ \cos \theta = \frac{ adjacent }{ hypotenuse } ~~\tan \theta = \frac{ opposite }{ adjacent }\]
BeccaB003
  • BeccaB003
I need to calculate the length of NO. I know how to work these problems EXCEPT I don't know whether to use sin cos or tan.

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More answers

Nnesha
  • Nnesha
alright as you can the functions i posted hve 3 variables so to find NO you should know one angel and one side so we have to use sin \[\huge\rm sin(60)= \frac{ opposite }{hyp }\]
Nnesha
  • Nnesha
let NO=x so x is the opposite side of angle 60 and hyp is 24 so substitute \[\huge\rm sin(60)= \frac{ x}{24}\] solve for x :=)
BeccaB003
  • BeccaB003
So, in a problem like this, whenever you have the information of one angle and one side you always use sin?
Nnesha
  • Nnesha
nope it depends on sides and angles like which angle and side they gave you
Nnesha
  • Nnesha
for this problem we have to apply sin bec like i said earlier we need one angle and one side so given is hyp and angle and we need to find NO which is opposite side of angle that's why sin
BeccaB003
  • BeccaB003
So, sin 60 = .866 * 24 = 20.785
Nnesha
  • Nnesha
mod should be on degree!!
Nnesha
  • Nnesha
e*
xapproachesinfinity
  • xapproachesinfinity
sin60=root3/2 no need to write before simplifying
Nnesha
  • Nnesha
yes that's right
xapproachesinfinity
  • xapproachesinfinity
i meant no decimal before simplifying :)
BeccaB003
  • BeccaB003
My calculator is on degree. I checked. Also, I need to know How to know whether a problem is sin cos or tan?? I want to be able to know right off from looking at the problem which one I need to use.
Nnesha
  • Nnesha
well if you have 3 variables formula you should know values of 2 variables to find 3rd one |dw:1434509817378:dw| i need opposite side and given is hyp so i should apply sin which is equal to opposite over hyp
BeccaB003
  • BeccaB003
Also, my answer option isn't 20.785 These are the only options I have and they don't make sense when I do the problem: \[12\sqrt{2}\] 12 \[12\sqrt{3}\] \[24\sqrt{3}\]
xapproachesinfinity
  • xapproachesinfinity
it is just convenient that you write roots as they are
xapproachesinfinity
  • xapproachesinfinity
you see if the answer were written in that form, no decimal no calculator is needed!
Nnesha
  • Nnesha
okay then :D
Nnesha
  • Nnesha
it depends on answer choices :=)
xapproachesinfinity
  • xapproachesinfinity
not really most often radical need to be written as they if we cannot simplify them
xapproachesinfinity
  • xapproachesinfinity
as they are*
BeccaB003
  • BeccaB003
I'm confused. I did the problem but it isn't one of the options.... can you convert it??
xapproachesinfinity
  • xapproachesinfinity
that is why i'm saying that lol you see sin60=x/24 ===> x=24sin60=24 root(3)/2=12root(3)
Nnesha
  • Nnesha
yes otherwise they should know the unit circle pattrn or at least memorize it
xapproachesinfinity
  • xapproachesinfinity
12 root(3) is your answer dear :)
xapproachesinfinity
  • xapproachesinfinity
yeah must have the unit circle :)
BeccaB003
  • BeccaB003
Also, @Nnesha thank you for your example about recognizing sin, cos, and tan. After I've completed the current problem, can you draw another example like you did and see if I can recognize the correct one; sin, cos, or tan?
BeccaB003
  • BeccaB003
Thank you! @xapproachesinfinity
xapproachesinfinity
  • xapproachesinfinity
no problem
Nnesha
  • Nnesha
they are not allowed to have unit circle 'n the final exam :=)
Nnesha
  • Nnesha
:3
xapproachesinfinity
  • xapproachesinfinity
i meant they need to know some way or the other not taking it in the exams hahaha
xapproachesinfinity
  • xapproachesinfinity
i actually memorized them from table lol but if i forgot any one of them i use special triangles
BeccaB003
  • BeccaB003
haha! oh bother..... my exam is gonna be fun. I never learned about a 'unit circle' in my class.....
Nnesha
  • Nnesha
^^^^see
Nnesha
  • Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @xapproachesinfinity i actually memorized them from table lol but if i forgot any one of them i use special triangles \(\color{blue}{\text{End of Quote}}\) same i memorized it 2 no time for 45-45-9- and 30-60-90 theorem :D
Nnesha
  • Nnesha
oh forgot about that okay give me a sec
Nnesha
  • Nnesha
|dw:1434511171692:dw| find angle B :=_
Nnesha
  • Nnesha
|dw:1434511566103:dw| or this one :=)

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