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anonymous

  • one year ago

help please

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  1. anonymous
    • one year ago
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    what exactly?

  2. anonymous
    • one year ago
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  3. anonymous
    • one year ago
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    Do you know 30-60-90 triangle rule?

  4. anonymous
    • one year ago
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    no

  5. anonymous
    • one year ago
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    best way is to use law of cosines

  6. anonymous
    • one year ago
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    c^2 = a^2 + b^2 - 2ab cos C

  7. anonymous
    • one year ago
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    plug in 60 for cos(c) (so basically cos(60)) and plug in 3 and 4 for a and b respectively

  8. anonymous
    • one year ago
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    \[c^2=1^2+4^2-2\times 3 \times 4 \times \cos (60)\]

  9. anonymous
    • one year ago
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    so replace that 1^2 with 3^2

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spraguer (Moderator)
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