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madisonmaruhnich94

Find the surface area of the sphere to the nearest square unit. hold on, i have to draw it

  • one year ago
  • one year ago

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  1. madisonmaruhnich94
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    |dw:1347568958290:dw|

    • one year ago
  2. lgbasallote
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    \[\huge SA = 4\pi r^2\] will that help?

    • one year ago
  3. Doman
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    just make sure ur using the radius not the diameter

    • one year ago
  4. madisonmaruhnich94
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    no it doesn't help/: A. 13 in.2 B. 50 in.2 C. 6 in.2 D. 3 in.2

    • one year ago
  5. madisonmaruhnich94
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    how do i find the answer

    • one year ago
  6. lgbasallote
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    what is your radius in this problem? do you know?

    • one year ago
  7. madisonmaruhnich94
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    2?

    • one year ago
  8. lgbasallote
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    no. that is the diameter. to get the radius, divide that by 2

    • one year ago
  9. madisonmaruhnich94
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    so 1?

    • one year ago
  10. lgbasallote
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    right. so substitute that to the equation i gave you

    • one year ago
  11. madisonmaruhnich94
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    i feel like an idiot, idk what to do

    • one year ago
  12. lgbasallote
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    r = 1 right? because it's the radius`

    • one year ago
  13. madisonmaruhnich94
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    yes

    • one year ago
  14. madisonmaruhnich94
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    would it be 3 in^2

    • one year ago
  15. lgbasallote
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    so replace r with 1 in the equation i wrote...what do you get?

    • one year ago
  16. madisonmaruhnich94
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    13 in^2

    • one year ago
  17. madisonmaruhnich94
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    ?

    • one year ago
  18. lgbasallote
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    will you elaborate how you got that?

    • one year ago
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