hugsandkisses
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
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TuringTest
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what google didn't work this time?
JamesJ
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\[ Surface \ Area = 4 \pi r^2 \]
where r is the radius.
Use this formula to find the answer.
FoolForMath
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Google is not smart enough.
TuringTest
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\[A=4\pi r^2\]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
hugsandkisses
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k, thanks
TuringTest
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what did you get?
FoolForMath
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well calculating things is actually hard; no ?
TuringTest
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It would seem
hugsandkisses
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wait, what the heck is the radius?
rainbow22
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The answer.
FoolForMath
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yeah it's a heck! what the heck is that!!!
GT
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That is what needs to be figured out. So, call it r for now.
EarthCitizen
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Just explain the damn thing!
hugsandkisses
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oh wait, sorry. that was a dumb question. I was looking at it backwards
rainbow22
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What's wrong with Google?
TuringTest
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your mantra:\[A=4\pi r^2\]so\[r=\sqrt{\frac{A}{4\pi}}\]
GT
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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.
FoolForMath
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lol Mantra.
EarthCitizen
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whose arrongant and pompous by teasing ppl for the unfamiliarity with a topic! Focus!
TuringTest
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where is saifoo?
he is neglecting his modship
GT
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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.
hugsandkisses
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wait, you guys.. im totally lost :-/ i need help.
FoolForMath
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pro-tempo-re mods can't be assigned much of tasks
TuringTest
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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.
EarthCitizen
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then tech the best way YOU CAN!
FoolForMath
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On the contrary I find EarthCitizen a bit swanky.
EarthCitizen
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teach
FoolForMath
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TuringTest: May be she needs helps in finding the square root too ?
GT
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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 = ?
hugsandkisses
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2.5?
TuringTest
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Yes
Yes
Yes
EarthCitizen
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yep
GT
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Yay! Good job.
FoolForMath
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Congratz.
hugsandkisses
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oh thank god!
FoolForMath
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Magnum opus!
hugsandkisses
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sorry you guys for being so cranky. along with math, I am also completing an essay. lots of work and multi tasking
FoolForMath
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Apology accepted.
GT
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We are thick skinned! Glad to see you do it.
bimbim2697
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GT CAN U HELP ME PLZ?
hugsandkisses
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thankyou. still a lot more!! have the patience?
GT
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Well, I am also dark skinned on top!! hahahahaahaha.
FoolForMath
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lol! I ain't dark skinned like you GT :P
EarthCitizen
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i see the light in U!
Atchyut
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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.