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stupidinmath

  • one year ago

how can i find the perimeter of the shaded region? any formula for the arc?

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  1. stupidinmath
    • one year ago
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  2. Andras
    • one year ago
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    This is very similar to the last question you asked. Where do you get stuck?

  3. stupidinmath
    • one year ago
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    formulas.. :|

  4. stupidinmath
    • one year ago
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    i'm confused if all forulas are same or not

  5. stupidinmath
    • one year ago
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    about the arcs

  6. Andras
    • one year ago
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    I hope now you remember the formula for the perimeter of the circle

  7. Abhishek619
    • one year ago
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    make use of symmetry..it's helpful

  8. stupidinmath
    • one year ago
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    yep, pi(diameter)

  9. Andras
    • one year ago
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    Yep that is right. What fraction of the circle is the arc you have here?

  10. stupidinmath
    • one year ago
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    1/4

  11. Andras
    • one year ago
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    The other 2 sides are just str8 lines

  12. stupidinmath
    • one year ago
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    yep.. which is equal to 20

  13. Andras
    • one year ago
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    Can you find the solution now? You have written all the necessary information down already

  14. Andras
    • one year ago
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    pi(diameter) is correct for the circle but get used to 2pi(radius), that is a more common notation

  15. stupidinmath
    • one year ago
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    should i use the formul.. l+ 2(pi)(r)(theta/360)?

  16. stupidinmath
    • one year ago
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    i mean l= 2(pi)(r)(theta/360)?

  17. Andras
    • one year ago
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    You do not need that. Just forget the above 2 lines.

  18. Andras
    • one year ago
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    You need the perimeter of the circle: 2pi(radius) and the fraction 1/4

  19. stupidinmath
    • one year ago
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    oh, just that? to get the arc length?

  20. Andras
    • one year ago
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    yep

  21. Andras
    • one year ago
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    That arc length has 1/4 of the perimeter of a full circle

  22. stupidinmath
    • one year ago
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    my answer is.. 35.71.

  23. stupidinmath
    • one year ago
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    thank you so much:)

  24. Andras
    • one year ago
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    Yep that is it

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