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AmberBamber

  • one year ago

(Pre-cal: law of cosines) Find the area of the triangle. A=47 degrees b=32ft c=19 ft @amistre64

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  1. amistre64
    • one year ago
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    law of cosine is a general version of the pythag thrm

  2. amistre64
    • one year ago
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    in this case: a^2 = b^2 + c^2 - 2bc cosA

  3. amistre64
    • one year ago
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    when the angle given is 90 degrees this simplifies to: a^2 = b^2 + c^2 such that a is the hypotenuse

  4. AmberBamber
    • one year ago
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    Oh, so I need to find a before I can do s=a+b+c/2 and plug in for are.

  5. AmberBamber
    • one year ago
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    area*

  6. amistre64
    • one year ago
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    |dw:1359387445633:dw|

  7. AmberBamber
    • one year ago
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    Then plug in s and the values of a, b, and c in the area formula. A=sqrts(s-a)(s-b)(s-c)

  8. amistre64
    • one year ago
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    if you want to do herons formula then yes, you would need to know all the side lengths

  9. AmberBamber
    • one year ago
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    Okay, well that's the only way I learned so I'm going to do it that way. But thank you! I needed a refresher :)

  10. amistre64
    • one year ago
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    good luck :)

  11. AmberBamber
    • one year ago
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    Thanks. :)

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