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anonymous

  • one year ago

Fan & Medal to most helped Calculate EBA , given DA and m EFA =178º. The figure is not drawn to scale 90° 45° 133° 266° http://static.k12.com/eli/bb/817/-1/0/2_36869_44974/-1/5c45df68fdad740c9f94d22ea5f92dd60c7a03f7/media/ccdbc5a3efc5b98917c43109efe2d5434ef545be/mediaasset_651869_1.jpg

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  1. dan815
    • one year ago
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    oh these are interesting

  2. dan815
    • one year ago
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    have u tried anything

  3. dan815
    • one year ago
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    |dw:1438749327954:dw|

  4. anonymous
    • one year ago
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    i thoguht it wa 90.......

  5. anonymous
    • one year ago
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    but now i think it is 45

  6. dan815
    • one year ago
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    |dw:1438749900936:dw|

  7. dan815
    • one year ago
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    u know that triangle there has a 91, so that angle has to be less than 89 at least

  8. DanJS
    • one year ago
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    This page i linked before is a good help... http://www.regentsprep.org/Regents/math/geometry/GP15/CircleAngles.htm

  9. DanJS
    • one year ago
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    very bottom one this time

  10. anonymous
    • one year ago
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    so it is 90?

  11. mathstudent55
    • one year ago
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    @HWBUSTER00 The problem states "given DA", but the measure of arc DA is not there. What is it?

  12. mathstudent55
    • one year ago
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    |dw:1438787940138:dw|

  13. mathstudent55
    • one year ago
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    Without the measure of arc AD, you can;t solve this problem.

  14. anonymous
    • one year ago
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    ...well there are multiple choice so it is one of them

  15. mathstudent55
    • one year ago
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    Why does the problem state "given DA" when DA is not given above? Did you copy all the information from the problem into your post?

  16. anonymous
    • one year ago
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    lol yes i did . that is the exact question . i think the teacher messed up . but that is the question

  17. mathstudent55
    • one year ago
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    Well, then, let's see if there are choices we can eliminate. |dw:1438788488246:dw|

  18. mathstudent55
    • one year ago
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    |dw:1438788576392:dw|

  19. mathstudent55
    • one year ago
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    Now let's look at the choices. Choice A. m<B = 90 2(90) = 178 - mDA mDA = -2 Since an arc cannot have a negative measure, choice A can't be correct.

  20. mathstudent55
    • one year ago
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    Choice B. m<B = 45 2(45) = 178 - mDA mDA = 88 This solution is possible, since we get a positive number for mDA

  21. anonymous
    • one year ago
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    so since it is less than 90 it has to be 45 right

  22. mathstudent55
    • one year ago
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    Choice C. m<B = 133 2(133) = 178 - mDA mDA = -88 This solution is not possible, since we get a negative number for mDA

  23. mathstudent55
    • one year ago
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    Choice C. m<B = 266 2(266) = 178 - mDA mDA = -354 This solution is not possible, since we get a negative number for mDA

  24. anonymous
    • one year ago
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    so it is 45

  25. mathstudent55
    • one year ago
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    The only solution that works is B. 45

  26. mathstudent55
    • one year ago
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    yes

  27. anonymous
    • one year ago
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    thanks also what is cos(x) when it is -1

  28. anonymous
    • one year ago
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    is it 360 or -360

  29. mathstudent55
    • one year ago
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    |dw:1438789256863:dw|

  30. mathstudent55
    • one year ago
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    The angle whose cosine is -1 is 180 or -180, and all coterminal angles.

  31. anonymous
    • one year ago
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    oh so nothing it is not 360 or -360. ok thats all i needed to know

  32. mathstudent55
    • one year ago
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    360 and -360 is the same as 0 degrees. There, the cosine is 1, not -1

  33. anonymous
    • one year ago
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    ok thank you

  34. mathstudent55
    • one year ago
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    You're welcome.

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