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xRAWRRx3 Group Title

Please help :( Given: Circle O with tangent PA , secant PBC, diameter DOE, and chord AC. PA = 20, PB = 8, AF = CF, measure angle APC = 49, and measure of arc AB = 41. Please help me find the measure of angle COD.

  • 2 years ago
  • 2 years ago

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  1. xRAWRRx3 Group Title
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    |dw:1338705728728:dw|

    • 2 years ago
  2. dpaInc Group Title
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    are the angle measure and arc measures are in degrees?

    • 2 years ago
  3. xRAWRRx3 Group Title
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    yes.

    • 2 years ago
  4. Callisto Group Title
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    Angle AOB = 41 degrees angle AOC = 180 - 41 degrees = 139 degrees (adj. angles on st. line) Since AF = FC . OD is perpendicular to AC (line joining from centre perpendicular to chord bisects chord) and triangle AOC is an isos triangle angle AOD = angle DOC = angle AOC / 2 = 139/2 = ... ?

    • 2 years ago
  5. dpaInc Group Title
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    69.5??? |dw:1338706212875:dw|

    • 2 years ago
  6. shubhamsrg Group Title
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    i'll give you hints : (altough i find some info to be useless in the ques) use these things : 1)join OA 2) if a line from the center bisects a chord,that line is perpendicular to the chord 3)a perpendicular to the opposite side in an isosceles triangle bisects the angle in between 4)tangent and radius are perpendicular 5)sum of angles in a triangle = 180 6)sum of linear angles =180 you should get your ans then..

    • 2 years ago
  7. shubhamsrg Group Title
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    hmmn..@dpaInc already solved it !!

    • 2 years ago
  8. xRAWRRx3 Group Title
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    yeahh, pretty much. But thanks, everyone, for helping me x) You all helped me understand the problem a little bit more so thank you x)

    • 2 years ago
  9. xRAWRRx3 Group Title
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    I wish I can give medals to you all but sadly, I can't :(

    • 2 years ago
  10. dpaInc Group Title
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    no...it was @Callisto ... :) wish i could take credit though...

    • 2 years ago
  11. Callisto Group Title
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    You guys make it too.... complicated :|

    • 2 years ago
  12. dpaInc Group Title
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    :) that's what we do....

    • 2 years ago
  13. shubhamsrg Group Title
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    oh yes..i missed @Callisto post...hmnn..

    • 2 years ago
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