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Math Help - area, perimeter and units

  1. #1
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    area, perimeter and units

    if we have a circle with perimeter 30 cm, how many cm^2(exactly) are in the circle area? in other words, how many square units(cm^2)(but exactly) are there, if i were count them?
    Thanks for your supports and sorry for my languages...
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  2. #2
    Member Nacho's Avatar
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    <br />
2\pi r = 30 \Leftrightarrow r = \frac{{30}}<br />
{{2\pi }} \Rightarrow A_ \odot   = \pi \left( {\frac{{30}}<br />
{{2\pi }}} \right)^2 <br />
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  3. #3
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    Quote Originally Posted by Nacho View Post
    <br />
2\pi r = 30 \Leftrightarrow r = \frac{{30}}<br />
{{2\pi }} \Rightarrow A_ \odot   = \pi \left( {\frac{{30}}<br />
{{2\pi }}} \right)^2 <br />
    thanks but u calculate circle area. i want to count only exact square units(not semi-square or another) in the circle area...i hope i can explain the problem correctly....
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  4. #4
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    Quote Originally Posted by turkmath View Post
    thanks but u calculate circle area. i want to count only exact square units(not semi-square or another) in the circle area...i hope i can explain the problem correctly....
    Do you mean how many actual squares, 1 cm on a side, can be put into the circle without overlapping?
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  5. #5
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    Quote Originally Posted by HallsofIvy View Post
    Do you mean how many actual squares, 1 cm on a side, can be put into the circle without overlapping?
    totally yes, yes...this is true question and good meaning...
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  6. #6
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    is it complicate or advanced question?
    Last edited by turkmath; November 11th 2008 at 03:21 PM. Reason: true sentence
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  7. #7
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    pls help, thanks for your supports...
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  8. #8
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    it is still unsolved... Can i use any math software for solving this problem?Thanks for your comments...
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