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hugsandkisses

  • 2 years ago

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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  1. TuringTest
    • 2 years ago
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    what google didn't work this time?

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

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

  4. TuringTest
    • 2 years ago
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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

  5. hugsandkisses
    • 2 years ago
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    k, thanks

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

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

  8. TuringTest
    • 2 years ago
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    It would seem

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

  10. rainbow22
    • 2 years ago
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    The answer.

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

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

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

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

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

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

  17. GT
    • 2 years ago
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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.

  18. FoolForMath
    • 2 years ago
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    lol Mantra.

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

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

  21. GT
    • 2 years ago
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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.

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

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

  24. TuringTest
    • 2 years ago
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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.

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

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

  27. EarthCitizen
    • 2 years ago
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    teach

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

  29. GT
    • 2 years ago
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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 = ?

  30. hugsandkisses
    • 2 years ago
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    2.5?

  31. TuringTest
    • 2 years ago
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    Yes Yes Yes

  32. EarthCitizen
    • 2 years ago
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    yep

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

  34. FoolForMath
    • 2 years ago
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    Congratz.

  35. hugsandkisses
    • 2 years ago
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    oh thank god!

  36. FoolForMath
    • 2 years ago
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    Magnum opus!

  37. hugsandkisses
    • 2 years ago
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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

  38. FoolForMath
    • 2 years ago
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    Apology accepted.

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

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

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

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

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

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

  45. Atchyut
    • 2 years ago
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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.

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