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gabbyalicorn

  • one year ago

A circular piece of metal has a radius of 3.5 meters. The metal sells for $3.25 per square meter. What is the total cost of the circular piece of metal? A. $11.38 B. $38.47 C. $71.44 D. $125.01

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  1. anonymous
    • one year ago
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    first find the area of the metal

  2. anonymous
    • one year ago
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    Do you remember the formula for the area of a circle?

  3. gabbyalicorn
    • one year ago
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    not really

  4. gabbyalicorn
    • one year ago
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    wait yes 3.14

  5. anonymous
    • one year ago
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    The formula is \[\pi r ^{2}\]

  6. anonymous
    • one year ago
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    where r is the radius

  7. gabbyalicorn
    • one year ago
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    so 9.8596

  8. anonymous
    • one year ago
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    nope

  9. anonymous
    • one year ago
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    what's the radius of the circle?

  10. gabbyalicorn
    • one year ago
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    umm 3.5

  11. anonymous
    • one year ago
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    yep, so plug it into the formula and tell me what the area is

  12. gabbyalicorn
    • one year ago
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    10.99

  13. anonymous
    • one year ago
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    no

  14. anonymous
    • one year ago
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    what is 3.5^2

  15. gabbyalicorn
    • one year ago
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    12.25

  16. anonymous
    • one year ago
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    correct. now multiply that by pi

  17. gabbyalicorn
    • one year ago
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    38.465

  18. anonymous
    • one year ago
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    yep, 38.5 works

  19. anonymous
    • one year ago
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    ok, so that is the area of the metal

  20. anonymous
    • one year ago
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    now we need to multiply that value by 3.25 to get the cost

  21. gabbyalicorn
    • one year ago
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    okie so do we multiply 3.25 by π

  22. anonymous
    • one year ago
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    no, multiply it by the area

  23. gabbyalicorn
    • one year ago
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    which is -3- 3.5?

  24. anonymous
    • one year ago
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    you just calculated the area

  25. gabbyalicorn
    • one year ago
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    oh 38.5

  26. anonymous
    • one year ago
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    38.5 x 3.25

  27. gabbyalicorn
    • one year ago
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    125.125

  28. gabbyalicorn
    • one year ago
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    so D?

  29. anonymous
    • one year ago
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    yep

  30. gabbyalicorn
    • one year ago
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    :D ty!

  31. anonymous
    • one year ago
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    no problem

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