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rebecca1233 Group Title

] The radius of a circle is multiplied by 10. Its area is _____ times bigger than the original circle.

  • one year ago
  • one year ago

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  1. rebecca1233 Group Title
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    @Mertsj Can you guide me please

    • one year ago
  2. rebecca1233 Group Title
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    @mathteacher1729

    • one year ago
  3. Mertsj Group Title
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    Lets make two circles. Let the radius of the first one be 1 and the radius of the second one be 10.

    • one year ago
  4. rebecca1233 Group Title
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    alright

    • one year ago
  5. Mertsj Group Title
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    |dw:1362242349336:dw|

    • one year ago
  6. Mertsj Group Title
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    What is the area of the first circle? Just leave your answer in terms of pi.

    • one year ago
  7. Mertsj Group Title
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    What is the area of the second circle? Again, leave your answer in terms of pi.

    • one year ago
  8. rebecca1233 Group Title
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    but thats not what its asking for so the answer is 10

    • one year ago
  9. Mertsj Group Title
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    No, sweetheart. Just answer my questions. I'm trying to help you understand so you don't have to do so much work on the next problem you have that is similar to this one.

    • one year ago
  10. rebecca1233 Group Title
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    so the first one is 1

    • one year ago
  11. rebecca1233 Group Title
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    wait do i just do 10*10 cause its 10 times bigger that will give me 100

    • one year ago
  12. Mertsj Group Title
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    |dw:1362242536230:dw|

    • one year ago
  13. rebecca1233 Group Title
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    3.14 (1)

    • one year ago
  14. Mertsj Group Title
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    What is the area of the second circle? Don't use 3.14. Just leave your answer in terms of pi

    • one year ago
  15. rebecca1233 Group Title
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    10

    • one year ago
  16. rebecca1233 Group Title
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    ii ( 10)

    • one year ago
  17. Mertsj Group Title
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    |dw:1362242645972:dw|

    • one year ago
  18. rebecca1233 Group Title
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    alright so what next

    • one year ago
  19. Mertsj Group Title
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    So do you see that to find how many times bigger the second circle is we should divide the area of the second circle by the area of the first circle?

    • one year ago
  20. rebecca1233 Group Title
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    so the area of the first circle is 1

    • one year ago
  21. Mertsj Group Title
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    Please look at the drawing I made. For the little circle, it says A = what?

    • one year ago
  22. rebecca1233 Group Title
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    pie

    • one year ago
  23. Mertsj Group Title
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    And the area of the big circle is what?

    • one year ago
  24. rebecca1233 Group Title
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    100pie

    • one year ago
  25. Mertsj Group Title
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    And what is 100 pi divided by pi ?

    • one year ago
  26. rebecca1233 Group Title
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    100 / 3.14

    • one year ago
  27. Mertsj Group Title
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    |dw:1362242866060:dw|

    • one year ago
  28. rebecca1233 Group Title
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    100

    • one year ago
  29. rebecca1233 Group Title
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    when i divide a 100 by pie i get a decimal

    • one year ago
  30. Mertsj Group Title
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    |dw:1362242905509:dw|

    • one year ago
  31. rebecca1233 Group Title
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    it equals 100

    • one year ago
  32. Mertsj Group Title
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    Do you understand so far because here is the important part which will save you work in the future?

    • one year ago
  33. rebecca1233 Group Title
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    yes. i get it :) Thanks. can you help me with a few more questions im stuck on

    • one year ago
  34. rebecca1233 Group Title
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    please

    • one year ago
  35. Mertsj Group Title
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    Wait. I want to teach you the general principle of the problem we just did.

    • one year ago
  36. rebecca1233 Group Title
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    oh ok

    • one year ago
  37. Mertsj Group Title
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    In finding the area of a circle, what do you do with the radius?

    • one year ago
  38. Mertsj Group Title
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    You square the radius don't you?

    • one year ago
  39. rebecca1233 Group Title
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    yes

    • one year ago
  40. Mertsj Group Title
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    So, if we make the radius 10 times bigger and then square it, since 10 squared is 100, the new circle will be 100 times bigger. Do you understand that?

    • one year ago
  41. rebecca1233 Group Title
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    yes

    • one year ago
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