anonymous
  • anonymous
Which trig function would I use to solve this?
Geometry
katieb
  • katieb
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anonymous
  • anonymous
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Castiel
  • Castiel
sin(fi)=opposite/hypotenuse cos(fi)=adjacent/hypotenuse tan(fi)=opposite/adjacent To know which one is opposite and which one adjacent you look from the corner where your fi is located, in your case fi=70 degrees. And you know hypotenuse is 14. Which formula has both x and hypotenuse?
Castiel
  • Castiel
To be more clear: sin(fi)= (opposite side of fi)/hypotenuse cos(fi)= (adjacent side to fi)/hypotenuse

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Castiel
  • Castiel
You already know that hypotenuse=14 and you can calculate sin(70) or cos(70) . You just need to put that two in the correct formula that also includes x.
anonymous
  • anonymous
so i can use sin or cos?? because i thought i was supposed to use cos but i got the wrong answer when using cos70=adj/hyp=x/14
freckles
  • freckles
x doesn't touch 70 deg so x is definitely not adjacent side to angle with deg 70
freckles
  • freckles
you could have used that other angle if you wanted to use cos 90-70=20 so cos(20)=x/14 would have been correct or sin(70)=x/14 would have been correct
freckles
  • freckles
oh wow this was an hour ago :p
anonymous
  • anonymous
Nah it's cool because I'm still stuck lmao
anonymous
  • anonymous
but i'll try that now. thanks. :)

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