Missaa143
Needing help(: PLEASE!



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luckythebest
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so whats the question sir

Missaa143
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Missaa143
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Missaa143
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answers to the bottom
–70.3
12.4
11.1
6.5

Missaa143
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answers to the top
3.7
11.5
3.3
4.5

luckythebest
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Ok. so which trigonometric ratio would mean the ratio of \[\frac{ 9 }{ x }\]

SerikMB
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use sine theorem

SerikMB
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note sin(90)=1

Missaa143
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wait what lol sorry guys im not that great at this :(

luckythebest
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@Missaa143 at least you are aware that there is something called sin x, cos x etc etc etc ?

Missaa143
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yes

SerikMB
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ok, let's consider the first one

SerikMB
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use pythogorean theorem to find hypothenuse (the longest side of right triangle)

Missaa143
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okay right

SerikMB
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hypothenuse^2=5^2+x^2

SerikMB
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hypothenuse/sin(90)=x/sin(42)

luckythebest
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@Missaa143 so you know which side divided by which side is cos of any angle?

Missaa143
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okay gotcha!

SerikMB
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or you can go directly, x/sin(42)=5/sin(9042)

Missaa143
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7/30

Missaa143
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= 0

luckythebest
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u can also use Tan of 42 = x / 5.

Missaa143
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true! ^

Missaa143
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ill say the first one is 3.3 ?

SerikMB
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\[\frac{ x }{ \sin(42) }=\frac{ 5 }{ \sin48 }\]

SerikMB
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no it will be 4.5

Missaa143
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Ooooo okay i get it!

luckythebest
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in 2nd one you have hypotenuse = x, and base = 9.
So which trig. ratio means base/hypotenuse?

Missaa143
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i think its D ?

msoemosharro
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I think it would be easier if you use tan(42)=x/5 => x=5tan(42)