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22 November, 09:10

In triangle ABC, a = 3, b = 5, and c = 7. Find the approximate value of angle A.

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Answers (1)
  1. 22 November, 09:42
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    21.8° (22° to the nearest degree)

    Step-by-step explanation:

    Using cosine law:

    a² = b² + c² - 2bc (cosA)

    3² = 5² + 7² - 2 (5) (7) cosA

    cosA = 13/14

    A = 21.7867893

    Approximately angle: 22°
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