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Math Help - Surface Area of Annulus

  1. #1
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    Surface Area of Annulus

    What is it?
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  2. #2
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    I belive you mean a torous?
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  3. #3
    Super Member Rebesques's Avatar
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    There is an easy way to find the area of a torus.

    Remember, it can be isometrically transformed into a parallelogram; So the respective areas will be the same.

    (Try two cuts; one vertical, and after this, one across the lower end circle).
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