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Find the length of the radius of a sphere with a surface area of 78.54 km2. A. 5 ft B. 15 ft C. 10 ft D. 2.5 ft

Mathematics
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what google didn't work this time?
\[ Surface \ Area = 4 \pi r^2 \] where r is the radius. Use this formula to find the answer.
Google is not smart enough.

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Other answers:

\[A=4\pi r^2\]so\[r=\sqrt{\frac{A}{4\pi}}\]so plug in the value you are given for the area A, out will come r, your answer, as James will testify
k, thanks
what did you get?
well calculating things is actually hard; no ?
It would seem
wait, what the heck is the radius?
The answer.
yeah it's a heck! what the heck is that!!!
That is what needs to be figured out. So, call it r for now.
Just explain the damn thing!
oh wait, sorry. that was a dumb question. I was looking at it backwards
What's wrong with Google?
your mantra:\[A=4\pi r^2\]so\[r=\sqrt{\frac{A}{4\pi}}\]
EarthCitizen - Lot of people dedicate their time to help here. I don't think making demands on them and throwing arrogant insults is the best way to show respect and gratitude for their contributions.
lol Mantra.
whose arrongant and pompous by teasing ppl for the unfamiliarity with a topic! Focus!
where is saifoo? he is neglecting his modship
I don't remember anyone making fun of people for not knowing. Nobody even makes fun of not getting it. Yes, sometimes people do expect "learning" and insist on it.
wait, you guys.. im totally lost :-/ i need help.
pro-tempo-re mods can't be assigned much of tasks
Just for good measure\[A=4\pi r^2\]so\[r=\sqrt{\frac{A}{4\pi}}\]plug in the surface area (given in the problem) where the A in the formula goes. Out comes r, the answer.
then tech the best way YOU CAN!
On the contrary I find EarthCitizen a bit swanky.
teach
TuringTest: May be she needs helps in finding the square root too ?
Surface are of sphere = 4*pi*r^2 = 78.54km^2 So, r^2 = 78.54/(4*pi) So, r = SQRT(78.54/(4*pi)) So, r = ?
2.5?
Yes Yes Yes
yep
Yay! Good job.
Congratz.
oh thank god!
Magnum opus!
sorry you guys for being so cranky. along with math, I am also completing an essay. lots of work and multi tasking
Apology accepted.
We are thick skinned! Glad to see you do it.
GT CAN U HELP ME PLZ?
thankyou. still a lot more!! have the patience?
Well, I am also dark skinned on top!! hahahahaahaha.
lol! I ain't dark skinned like you GT :P
i see the light in U!
First of all question is somewhat wrong!!!!! Radius is a quantity representing length and radius doesn't need to be written as length of the radius. And coming to answer Surface area of sphere is 4*pi*r*r. From that r can be found out substituting others.

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