anonymous
  • anonymous
Please help! Use △DEF, shown below, to answer the question that follows: What is the value of x rounded to the nearest hundredth?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
@phi You there?
phi
  • phi
for the angle at D, which trig function should we use ?

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anonymous
  • anonymous
I think it should be the sin function? Because x is the adjacent.
phi
  • phi
people use SOH CAH TOA to remember or oscar had a heap of apples sin cos tan
anonymous
  • anonymous
Oh okay, well for this triangle, I think we should use sin because the Hypotenuse is 55 degrees and the Opposite is x which and we're also given the degrees for sin when it's being put into a fraction.
phi
  • phi
side x is the adjacent side for angle D
anonymous
  • anonymous
Oh, sorry, now I see. I was looking at it a different way. So then we'd use the cos function.
phi
  • phi
yes, cos. and sides are lengths (and measured in for example, feet, inches, meters, miles, *not* degrees) angles are measured in degrees or radians
anonymous
  • anonymous
|dw:1440787209071:dw|
anonymous
  • anonymous
This is what it would look like yes?
phi
  • phi
yes. multiply both sides by 55 and you get x= 55 cos(49) we now need a calculator.
anonymous
  • anonymous
Okay, so in my calculator I punched in 55 and then cos and it gave me: 0.5735. Then after that the new fraction would be: 0.5735 = x/55 Then, I'd take 55 and multiple it by 0.5735 and it'd give me: 31.54 which will equal x. For the next step it tells me to round to the nearest tenth which will give me: 32?
anonymous
  • anonymous
Oh wait, I think I was supposed to do 49 cos, not 55.
phi
  • phi
you ended up doing cos 55 try 55 times cos 49 enter
anonymous
  • anonymous
Oh okay, it gave me: 36.08 This question doesn't have multiple choices, I got 36 last time and punched it in the answer box and it told me it was wrong.
phi
  • phi
yes it wants x rounded to the nearest hundredth so 36.08
anonymous
  • anonymous
Hm, I'll try 36 again and then tell you what I got.
phi
  • phi
it wants it rounded to the nearest 100th. 36.08 if it won't take that, make a note and tell your teacher about it.
anonymous
  • anonymous
This is what is says: "Type the numeric answer only in the box below."
phi
  • phi
Use △DEF, shown below, to answer the question that follows: What is the value of x rounded to the nearest hundredth?
anonymous
  • anonymous
It says numerically, so that's why I put 36 as my answer. But I can try 36.08
phi
  • phi
numeric means "number" and 36.08 is a number this is instead of , for example, 55*cos(49) which is more accurate (because we do not round), but obviously it is not a simple number
anonymous
  • anonymous
Okay, I will put 36.08. Thank you for your help!

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