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anonymous

  • one year ago

In ∆ABC, what is the value of cos B? a) 5/4 b) 3/4 c) 3/5 d) 4/5 e) 4/3

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  1. anonymous
    • one year ago
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  2. sepeario
    • one year ago
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    do you know what ratio the cosine function represents?

  3. anonymous
    • one year ago
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    I forgot what it was... tbh.... I'm really horrible at math... and i couldn't catch on to it...

  4. sepeario
    • one year ago
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    Don't worry :) I can help you. Have you heard of SOH CAH TOA before?

  5. anonymous
    • one year ago
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    no i havent, my teacher never taught me that

  6. sepeario
    • one year ago
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    It essentially means \[\sin=O/H, \cos=A/H, \tan=O/A\]

  7. sepeario
    • one year ago
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    it's a mnemonic worth remembering for trigonometry.

  8. anonymous
    • one year ago
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    oohhh

  9. sepeario
    • one year ago
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    so if cos = adjacent/hypotenuse, do you know which to sides these are in relation to angle b?

  10. anonymous
    • one year ago
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    adjacent and hypotenuse?

  11. anonymous
    • one year ago
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    @Sepeario

  12. sepeario
    • one year ago
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    yes but which sides are they in the above triangle?

  13. anonymous
    • one year ago
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    3 and 5??

  14. anonymous
    • one year ago
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    right?

  15. anonymous
    • one year ago
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    @Sepeario

  16. sepeario
    • one year ago
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    yep, so the final ratio is?

  17. anonymous
    • one year ago
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    wait how would i put that in my calculator?

  18. anonymous
    • one year ago
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    i'm so sorry i literally forget so much stuff it's a problem....

  19. anonymous
    • one year ago
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    @Sepeario

  20. sepeario
    • one year ago
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    you can't really put that into a calculator. so what is the final answer?

  21. sepeario
    • one year ago
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    if adjacent = 3 and hypotenuse = 5 and cos 60 = a/h = ?

  22. anonymous
    • one year ago
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    frig..... um....

  23. anonymous
    • one year ago
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    it's 3/5??

  24. anonymous
    • one year ago
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    sorry i'm so tired and i have 6 online geometry tests to do by 1:18 p.m and its 8:21 a.m

  25. anonymous
    • one year ago
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    so is it 3/5 @Sepeario

  26. sepeario
    • one year ago
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    yep that's right

  27. sepeario
    • one year ago
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    good luck! and i'm sure you'll do well.

  28. anonymous
    • one year ago
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    i suck at math

  29. anonymous
    • one year ago
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    i'm gonna fail and have to repeat freshman year

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