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Mathhelp346

PLEASE HELP: The area of a circle is given by A=πr^2, where r is the radius. If the radius of a circle is increased y 4 inches, the area of the resulting circle is 100π square inches. Find the radius of the original circle.

  • one year ago
  • one year ago

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  1. Mathhelp346
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    This is what I did, but it's wrong. |dw:1354247106626:dw|

    • one year ago
  2. Bronco101
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    |dw:1354247301693:dw|

    • one year ago
  3. Bronco101
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    you just forgot the pi and it increased by for not multiplied by 4 so you only add 4

    • one year ago
  4. Bronco101
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    |dw:1354247411483:dw|

    • one year ago
  5. Bronco101
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    so you squarroot everything and get r+4=10

    • one year ago
  6. Mathhelp346
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    am i supposed to divide it all?

    • one year ago
  7. Bronco101
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    yeah beacuse you have to do the same thing on each side like you subrtract numbers from each side

    • one year ago
  8. Mathhelp346
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    but if i divide everything, wouldn't everything cancel out besides 100?

    • one year ago
  9. Mathhelp346
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    nevermind i understand now

    • one year ago
  10. Mathhelp346
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    thanks

    • one year ago
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