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anonymous

  • one year ago

find the length of the radius of circle c. http://media.education2020.com/evresources/2092539_2f57b746-c73f-4a4b-8c7e-ce9ee207b927.png

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  1. anonymous
    • one year ago
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    A. r=1 B. r=3 C. r=12 D. r=15

  2. anonymous
    • one year ago
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    @dan815

  3. anonymous
    • one year ago
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    @DanJS

  4. dan815
    • one year ago
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    okay that angle you see is actually in radians

  5. dan815
    • one year ago
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    when they say 4/9 pi they really mean 4/9 pi radius is our angle

  6. dan815
    • one year ago
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    that means this angle you see subtends a total of 4/9 pi radius units on the circumference of the circle

  7. dan815
    • one year ago
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    \[\frac{4}{9}\pi * r =\frac{20}{3} \pi \]\

  8. anonymous
    • one year ago
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    ohh

  9. dan815
    • one year ago
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    yep :) so what is r

  10. anonymous
    • one year ago
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    so it would be r=15

  11. dan815
    • one year ago
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    yep

  12. anonymous
    • one year ago
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    Thank you soo much

  13. DanJS
    • one year ago
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    arc length = radius* theta

  14. anonymous
    • one year ago
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    :)

  15. dan815
    • one year ago
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    dont let radians confuse you, its a very simple idea, we are saying the angle in terms of the radius units thats why there are 2pi radians in a circle beacuse the circumference of a circle is 2 pi r

  16. anonymous
    • one year ago
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    ok thank you.:)

  17. dan815
    • one year ago
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    welcome

  18. DanJS
    • one year ago
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    yeah , i was looking for a easy explination that @dan815 just said... http://www.themathpage.com/atrig/arc-length.htm

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