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agillogly

  • 2 years ago

Help!

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  1. goformit100
    • 2 years ago
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    ya say

  2. agillogly
    • 2 years ago
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  3. goformit100
    • 2 years ago
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    solve it by cosine rule

  4. agillogly
    • 2 years ago
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    I don't know how to.

  5. kr7210
    • 2 years ago
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    |dw:1339191253421:dw|

  6. kr7210
    • 2 years ago
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    use it

  7. agillogly
    • 2 years ago
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    How? I don't have all the measurements.

  8. alanli123
    • 2 years ago
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    You don't need all the measurements

  9. alanli123
    • 2 years ago
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    One sec

  10. alanli123
    • 2 years ago
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    |dw:1339195102769:dw|

  11. alanli123
    • 2 years ago
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    You know what b, c, and angle theta are. all you have to do is plug it in and solve for a

  12. agillogly
    • 2 years ago
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    Okay

  13. agillogly
    • 2 years ago
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    I got 130.9 and that isn't and option.

  14. alanli123
    • 2 years ago
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    one sec

  15. alanli123
    • 2 years ago
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    Could you explain to me how you got your answer?

  16. agillogly
    • 2 years ago
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    I just tried to plug everything in like you said. 7^2+9^2-2(7)cos(117). I got 136.35. I did something wrong the first time. But its obviously still wrong.

  17. alanli123
    • 2 years ago
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    Ok here's where you are wrong. It's 7^2+9^2-2ab cos 117. Can you see where you went wrong? (hint: you're missing b)

  18. alanli123
    • 2 years ago
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    You did -2(7), the correct term should be -2(7)(9) because it is -2ab

  19. agillogly
    • 2 years ago
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    Okay. I thought I forgot a number. Ill try it again.

  20. agillogly
    • 2 years ago
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    187.20?

  21. alanli123
    • 2 years ago
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    Yes!

  22. kr7210
    • 2 years ago
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    |dw:1339192083258:dw|

  23. alanli123
    • 2 years ago
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    You are correct!

  24. kr7210
    • 2 years ago
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    found ur answer?

  25. alanli123
    • 2 years ago
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    Medal please lol

  26. agillogly
    • 2 years ago
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    I picked 187.2 and it said the correct answer is 13.68.

  27. kr7210
    • 2 years ago
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    answer is 187.20

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