anonymous
  • anonymous
FINAL IN THE MORNING: the great circle of the sphere has a circumference of 24 (pic soon to be drawn in comments) what is the surface area
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
|dw:1370839886571:dw|
anonymous
  • anonymous
@FutureMathProfessor
anonymous
  • anonymous
help me please @FutureMathProfessor

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More answers

anonymous
  • anonymous
@Goldpheonix
anonymous
  • anonymous
Isn't this the same problem we helped you on earlier?
anonymous
  • anonymous
yes I don't know how but it got deleted
anonymous
  • anonymous
are you going to help me? @FutureMathProfessor
anonymous
  • anonymous
Ok so you have to find R from the equation of circumfrence and then plug that into the equation of surface area to find the surface area
anonymous
  • anonymous
how do I find r
anonymous
  • anonymous
@oldrin.bataku are you good at these
anonymous
  • anonymous
@FutureMathProfessor excuse me..
anonymous
  • anonymous
@mathstudent55 can you please help me
anonymous
  • anonymous
If the great circle has a circumference of \(24\), can you find its radius? This is also the radius of our sphere.
anonymous
  • anonymous
so 24 is the radius
anonymous
  • anonymous
no
anonymous
  • anonymous
how do I find the radius
anonymous
  • anonymous
\(C=2\pi r\) relates the circumference to the radius. If our circumference is \(24\), we have \(24=2\pi r\). Can you solve for \(r\)?
anonymous
  • anonymous
ok so the circumference is 24 so would the radius be 12
anonymous
  • anonymous
no
anonymous
  • anonymous
not to be rude, but im going to need a way better answer than "no" @FutureMathProfessor
anonymous
  • anonymous
You need to manipulate the circumfrence equation to solve for R.
anonymous
  • anonymous
but im on here because I don't know how to do that...and your not telling me how to set it up @FutureMathProfessor
anonymous
  • anonymous
@oldrin.bataku how d I find r
anonymous
  • anonymous
@.Sam. any ideas?
anonymous
  • anonymous
$$24=2\pi r\\12=\pi r\text{ after dividing both sides by }2\\\frac{12}\pi=r\text{ after dividing both sides by }\pi$$Now that we hav e \(r\), our surface area is given by \(A=4\pi r^2\).
anonymous
  • anonymous
ok I still don't see the radius..
anonymous
  • anonymous
\[A=4\Pi(\frac{ 12 }{ \Pi })^{2}\]
anonymous
  • anonymous
still not seeing how I would get the radius
anonymous
  • anonymous
any ideas @Tigger25
anonymous
  • anonymous
Listed below is the equation for the circumference of a circle:\[C=2(\Pi)R\] Since we know C, we can plug it in and solve for R. \[24=2(\Pi)R\] Let's manipulate the equation to solve for R.\[R=\frac{ 24 }{ 2*\Pi }\] Use that to find R, then we will plug R into our Sphere Surface Area Equation, listed below:\[SA=4(\Pi)R^2\] Since we have our R now, we can just plug that into our new equation to find SA (Surface Area) and then we will have our answer!
anonymous
  • anonymous
The radius is \[12/ \pi\] or 3.82 Then you substitute that in to the SA formula \[4 \pi r^2\] \[4\pi (3.82)^2\] and get 183.35
anonymous
  • anonymous
@ anyone else please tell me if I made a mistake ^^
anonymous
  • anonymous
I got two different answers and two different calculators...the format looks correct but im still not getting the answer
anonymous
  • anonymous
mt teacher came out wit 576pie
anonymous
  • anonymous
@Tigger25 ^
anonymous
  • anonymous
oh wow all this time the radius was 12 lol @FutureMathProfessor I got the answer
anonymous
  • anonymous
The radius is not 12!
anonymous
  • anonymous
Can I have a medal? :D
anonymous
  • anonymous
the radius was 12 that's how I got the CORRECT answer my teacher gave us..
anonymous
  • anonymous
what are themedals for though do yal get paid to answer questions?
anonymous
  • anonymous
The radius is 12/pi.............

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