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How to calculate length of x?

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Thread replies: 91
Thread images: 18

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How to calculate length of x?
>>
>>7633357
I'll give you a hint. A function is defined as the length of x (per your convention) in units of the radius of the circle, given an angle such as the one you marked as a parameter. The name of that function is cosine.

In other words, the cosine of the angle is the length of x in units of the radius (5 meters in your example).
>>
...
>>
Stupid questions belong in the stupid questions thread
>>
>>7633357
x/5 = cos(35)

x = 5cos(35)

x = 4.1
>>
>>7633383
you don't know the angle is in the centre of the circle
uncalculable
qed
>>
>>7633357
try using cosine you fucking retard. Unbelievable.
>>
>>7633412
180 - 35???
>>
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i dont know if this helps
>>
>>7633383
>>7633404
>>7633418
Unsure if meme or retarded. Use sine, not cosine.
>>
>>7633481
what in the fuck
>>
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>>7633481
>>7633494
baka
>>
>>7633357
sin(35) = x/(x+5)
>>
I haven't seen the first answer
>>
>>7633535
Why would it not just be sin(35) = x/5 ?
is that line that's already drawn not equal to 5?
>>
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>>7633357
this should be easy, hint: review your notes from freshman high-school
>>
>>7633549
>>
Is this /sci/ this fucking retarded?
>radius is 5
>x is a radius
>x = 5

DONE
>>
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>>7633586
>>
>>7633593
prove me wrong faggot
>>
>>7633586
Jesus Christ
>>
>>7633596
prove me wrong camdyass
>>
(x+5)sin35=x
x=6,73
>>
>>7633494
They have the right idea, they're just skipping the vital step where they change the angle from 35deg to 55deg. But either way works.

5sin(35deg)=5cos(55deg)=2.87
>>
>>7633595
>>7633600
how in god's name is x a radius?
>>
>>7633620
it's a line from the center of the circle to the end of the circle. How is it NOT a radius?
>>
>>7633619
This seems right, idk where these other people are getting sin(35) = x/(x+5)

>>7633613
How the fuck can x be greater than the radius 5?
>>
>>7633623
but it's not a line from the center of the circle to the end of the circle
it stops too short
>>
>>7633633
Jesus Christ.
>>
>>7633357
If you're in high school I don't know what your "teacher" thinking giving this to you. Circular conic section analysis like this requires a year of linear algebra at least.

Oxford PhD. B.S. M.D. B.A. M.A. in every existing school of pure math, here. Trust me.
>>
>>7633648
x is not a radius, you moron.
>>
ITT: everyone types before thinking
>>
>>7633652
>x is not a radius

But it's measured from the center
>>
>>7633660
More like ITT Tech am I right?
Idiot
>>
>>7633663
Fucking retard.
>>
>>7633661
correct, but it's not measured directly to the perimeter
>>
>>7633357
you mathematicians make me laugh, science literally gave you guys rulers and calculators yet you guys continue to over complicate things
>>
>>7633704
I kek'd
>>
ITT: /sci/ almost solves a babby tier math problem
>>
5 sin 35
>>
>>7633357
Use a ruler
>>
>>7633704
>>7633734
simply eric
>>
>>7633357
How close is this to the answer?
25.7142857143
>>
its literally one walrus man
>>
>>7633481
It doesn't because no one can read what you wrote.
>>
>>7633741
Why are you touching his penor?
>>
>>7633357
is it 5 divided by 90 times by 35?
I dont do math btw
>>
>>7633740
Please tell me you're joking.
>>
>>7633586
lol wut
>>
>>7633744
is this /pol/ now? Can't a guy be figuresexual and not face discrimination?
>>
am i wrong here or can you just take the percentage the percentage that the 35 degree angle takes from 180 and mulitply that x5 to get the answer?
>>
>>7633748
No you fucking cluck, you could have touched his legs hands face chest. But you chose to harrass this poor walrus and touch his penor while he remained helpless. You sick bastard
>>
>>7633753
Dude its 2015, are you seriously against molestationality?
>>
>>7633750
good fucking god
>>
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This thread is giving me aids but also making me lul.

Imma solve to end this bullshit
>>
>>7633809
already solved faggot
also you didn't have to use cos(55), you could have just used sin(35)
>>
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>this took /sci/ 5 hours and 55 posts to solve
>>
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>this fucking thread
>>
>>7633357
x = 5*sin(35*pi/180)
>>
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>>7633839
why the fuck are you converting to radians?
>>
x = 5 sin(35°) ~~ 2.867882181755230480540159564130789323102166857254931755405135590847284499262808050298610063201101666060109725991672466743808696007192303487192985710549680854417259467313175884575696463482427506408210884322524114424980746519299099495410124536714479360664132665035663567209862248852129177975770951415258833702728899665787138754952492001503760738332184805833449717424994278710671268229313303739292392270339391008708319678375025476720877254577784573305183635826847805782
>>
>>7633625
The people who thought (x+5)sin(35) = x thought the diagram meant the radius was x + 5 m.
>>
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>>7633586
>>7633623
>>7633652
>>7633750
>this people lurk on a math/science board

The world needs burger flippers lads....don't delude yourself
>>
>>7633357
5-sin(35deg) = ~4.426
>>
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>>7633357
I could not help but notice your png was not optimized anon.
I have optimized your png.
Your png is now optimized.
>>
>>7633586
top kek
>>
>>7633847
>not converting to radians
>>
>>7633864
>sigfig fags
>>
>>7633847
are you a degreefag or what
>>
>>7633864
Exact answers, please

x = 5sin(35) = 5(((-(6^(1/2))*(1+((3)^(1/2)/3)))/32 + i((-6(1+(3)^(1/2)/3)^2)+16)^(1/2)/32)^(1/3) + (-((6^(1/2))(1+3^(1/2)/3))/32 - i*((-6(1+(3^(1/2)/3))^2+16))^(1/2)/32)^(1/3))
>>
>>7633864
/thread
>>
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Christ you guys, I figured it out already but to those of you calling my question stupid/retarded, sorry for asking. I am a game designer not a mathematician/scientist.
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>>7633740
kek
>>
>>7633357
bro r u 12?
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>>7633586
>>
>>7633357

X is adjacent to the angle, so use cosine.
[math]cos(35) = x/r[/math]
Therefore,
[math]x = r\times cos(35)[/math]

Obviously, [math]r[/math] is the radius.
>>
>>7638628
My bad, X is not adjacent. I'm legally blind.
>>
Cos(90-35*)
>>
>>7633357
Sin of angle=Opposite/hypotenuse
sin T=x/radius
radius*sin T=x
>>
>>7633357
You can apply sin law like I was doing. But I don't have much time to solve this, basically x will be >>7633404
>>7633586
Are you a fucking idiot? X is obviously not, it's denoted under the circle as being shorter than the radius. Jesus christ. Spotted the engineering student
>>
>>7639994
Oops, pic related
>>
>>7633357
EVERYONE SHUT THE FUCK UP THIS IS THE CORRECT ANSWER.

cos(55)=(x)/(x+5)

x=(5/(1-cos(55)))-5

THERE IS NO DEBATE. IF YOU DISAGREE KILL YOURSELF
>>
YOU ARE A FUCKING RETARD
>>
Arccosine (7pi/36) for radians

Stop being a shitlord with degrees.
>>
>>7640668
its 5cos(35) u boob
>>
>>7642598
whoops, sorry senpai it's actually sin. thought the 35 deg was from the horizontal axis
>>
>>7640717
>given degrees
>answers in radians

kill yourself
>>
Diagram is fucking retarded. Next time OP write the radius next to the line that actually extends
from the centre of the circle to the edge.
Originally thought the problem specified that the radius is x+5.
So here is the solution to that problem.

(x+5)*sin(35) = x
x = (5*sin(35)/(1-sin(35))
x = 6.725
>>
>>7642690
x>5?
>>
>>7642690
Testing this cool Latex shit.

[math] (x+5)sin(35) = x [/math]
[math]x = \frac{5sin(35)}{1-sin(35)} [/math]
[math]x = 6.725 [/math]

>>7642708
Yeah if the radius of the circle is x+5 then x can be greater than 5
depending on how much angle there is.
It's not the problem OP asked though.
Thread posts: 91
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