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anonymous

  • one year ago

C is the center of the circle. Find the length of arc QPR http://media.education2020.com/evresources/2092515_f52585a6-6270-4c6d-939b-0093b7f0cc71.png

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  1. anonymous
    • one year ago
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    can someone please help me?

  2. anonymous
    • one year ago
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    i think th formula for this is A= theta/360 *pi*r^2 but im not sure.

  3. anonymous
    • one year ago
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    @dan815 ?

  4. anonymous
    • one year ago
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    WILL GIVE MEDAL!!

  5. anonymous
    • one year ago
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    @Luigi0210

  6. DanJS
    • one year ago
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    hi

  7. anonymous
    • one year ago
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    hi. Can you help with this question please?

  8. DanJS
    • one year ago
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    sure. The Radius is 15, so the total circumference of that circle is \[C = 2*\pi*r = 30\pi\]

  9. anonymous
    • one year ago
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    ohh

  10. anonymous
    • one year ago
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    wait so.. what was the formula for this?

  11. DanJS
    • one year ago
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    Circumference of a circle is 2 times pi times the radius

  12. DanJS
    • one year ago
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    They want the length of arc QPR which is some fraction of that total circumference

  13. anonymous
    • one year ago
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    A. S=23.55 B. S=47.10 C. S=70.65 D. S=141.30

  14. anonymous
    • one year ago
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    Would it be D?

  15. jim_thompson5910
    • one year ago
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    @huaman you said that `i think th formula for this is A= theta/360 *pi*r^2 but im not sure` that formula is for figuring out the AREA of a pie slice like you see below |dw:1441588452712:dw|

  16. DanJS
    • one year ago
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    Angle QCR = 90, so the rest of that is 360 - 90 =270 Arc QPR goes around 270 of the 360 total circumference, or 3/4

  17. anonymous
    • one year ago
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    so C?

  18. DanJS
    • one year ago
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    \[QPR = 2*\pi*15 *(\frac{ 270 }{ 360 })\]

  19. anonymous
    • one year ago
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    ohh taht makes so much more sense. Thank you very much. I got C.

  20. DanJS
    • one year ago
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    a fraction (270/360), of the total distance around the circle 2*pi*15

  21. DanJS
    • one year ago
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    yep yep

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