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sjg13e

  • one year ago

Find Arc Length

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  1. sjg13e
    • one year ago
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  2. sjg13e
    • one year ago
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    hi, i need helping with both parts of this question! i know that delta = s / r (in radians), but i can't seem to understand how to find the angle

  3. sjg13e
    • one year ago
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    i'm also going to assume r = 7.5

  4. anonymous
    • one year ago
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    there is one information just r.

  5. sjg13e
    • one year ago
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    yes, the only known variable is 'r'. but it seems that there's a way to find the numerical value of theta

  6. anonymous
    • one year ago
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    theta is approximately 60 degree

  7. welshfella
    • one year ago
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    you can make an estimate of the angle theta the slope is about 6.6 so find the angle whose tangent is 6.6

  8. welshfella
    • one year ago
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    that is 81 degrees to the nearest degree

  9. phi
    • one year ago
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    yes, I get height 8.4 and 1.33 to the right so 90 - arctan(1.33/8.4) = 81

  10. welshfella
    • one year ago
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    from this you can find the arc length s

  11. welshfella
    • one year ago
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    using radius of 7.5

  12. sjg13e
    • one year ago
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    thank you! i'll try to find s

  13. dinamix
    • one year ago
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    @phi i think its 80 cuz i use long method

  14. sjg13e
    • one year ago
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    yeah, it's 80!

  15. dinamix
    • one year ago
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    |dw:1440889274064:dw| @phi check my frw

  16. sjg13e
    • one year ago
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    i figured out s, it's 10.5 (1.396rad * 7.5). thank you all for your help! :)

  17. welshfella
    • one year ago
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    yw

  18. welshfella
    • one year ago
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    @dinamix what do you mean by the long method?

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