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anonymous

  • one year ago

In triangle ABC, a = 3, b = 5, and c = 7. Find the approximate value of angle A. a. 22° b. 38° c. 142° d. 158°

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  1. anonymous
    • one year ago
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    @amoodarya can you help please?

  2. amoodarya
    • one year ago
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    use law of cosine

  3. anonymous
    • one year ago
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    i dont remember how to do that

  4. amoodarya
    • one year ago
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    \[b^2+c^2-a^2=2bc \cos(A)\] put a,c,b in formula you will find cos(A)

  5. anonymous
    • one year ago
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    5^2+7^2-3^2=70cos a

  6. anonymous
    • one year ago
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    A=22

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