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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

  • 2 years ago
  • 2 years ago

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  1. TuringTest
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    what google didn't work this time?

    • 2 years ago
  2. JamesJ
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    \[ Surface \ Area = 4 \pi r^2 \] where r is the radius. Use this formula to find the answer.

    • 2 years ago
  3. FoolForMath
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    Google is not smart enough.

    • 2 years ago
  4. 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

    • 2 years ago
  5. hugsandkisses
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    k, thanks

    • 2 years ago
  6. TuringTest
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    what did you get?

    • 2 years ago
  7. FoolForMath
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    well calculating things is actually hard; no ?

    • 2 years ago
  8. TuringTest
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    It would seem

    • 2 years ago
  9. hugsandkisses
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    wait, what the heck is the radius?

    • 2 years ago
  10. rainbow22
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    The answer.

    • 2 years ago
  11. FoolForMath
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    yeah it's a heck! what the heck is that!!!

    • 2 years ago
  12. GT
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    That is what needs to be figured out. So, call it r for now.

    • 2 years ago
  13. EarthCitizen
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    Just explain the damn thing!

    • 2 years ago
  14. hugsandkisses
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    oh wait, sorry. that was a dumb question. I was looking at it backwards

    • 2 years ago
  15. rainbow22
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    What's wrong with Google?

    • 2 years ago
  16. TuringTest
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    your mantra:\[A=4\pi r^2\]so\[r=\sqrt{\frac{A}{4\pi}}\]

    • 2 years ago
  17. 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.

    • 2 years ago
  18. FoolForMath
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    lol Mantra.

    • 2 years ago
  19. EarthCitizen
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    whose arrongant and pompous by teasing ppl for the unfamiliarity with a topic! Focus!

    • 2 years ago
  20. TuringTest
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    where is saifoo? he is neglecting his modship

    • 2 years ago
  21. 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.

    • 2 years ago
  22. hugsandkisses
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    wait, you guys.. im totally lost :-/ i need help.

    • 2 years ago
  23. FoolForMath
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    pro-tempo-re mods can't be assigned much of tasks

    • 2 years ago
  24. 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.

    • 2 years ago
  25. EarthCitizen
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    then tech the best way YOU CAN!

    • 2 years ago
  26. FoolForMath
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    On the contrary I find EarthCitizen a bit swanky.

    • 2 years ago
  27. EarthCitizen
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    teach

    • 2 years ago
  28. FoolForMath
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    TuringTest: May be she needs helps in finding the square root too ?

    • 2 years ago
  29. 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 = ?

    • 2 years ago
  30. hugsandkisses
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    2.5?

    • 2 years ago
  31. TuringTest
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    Yes Yes Yes

    • 2 years ago
  32. EarthCitizen
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    yep

    • 2 years ago
  33. GT
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    Yay! Good job.

    • 2 years ago
  34. FoolForMath
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    Congratz.

    • 2 years ago
  35. hugsandkisses
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    oh thank god!

    • 2 years ago
  36. FoolForMath
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    Magnum opus!

    • 2 years ago
  37. 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

    • 2 years ago
  38. FoolForMath
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    Apology accepted.

    • 2 years ago
  39. GT
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    We are thick skinned! Glad to see you do it.

    • 2 years ago
  40. bimbim2697
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    GT CAN U HELP ME PLZ?

    • 2 years ago
  41. hugsandkisses
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    thankyou. still a lot more!! have the patience?

    • 2 years ago
  42. GT
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    Well, I am also dark skinned on top!! hahahahaahaha.

    • 2 years ago
  43. FoolForMath
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    lol! I ain't dark skinned like you GT :P

    • 2 years ago
  44. EarthCitizen
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    i see the light in U!

    • 2 years ago
  45. 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.

    • 2 years ago
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