In triangle ABC, side a=7, b=6, and c=8. Find the measure of angle B to the nearest degree.

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asked by Sue
  1. use the cosine law in this form

    6^2 = 7^2 + 8^2 - 2(7)(8)cos B

    let me know if you don't get angle B = 47°

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    posted by Reiny

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