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anonymous

  • one year ago

Suppose a triangle has sides a, b, and c, and let theta be the angle opposite he side length of a. If costheta>0 , what must be true? a- a^2+b^2=c^2 b-b^2+c^2<a^2 c-a^2+b^2>c^2 d-b^2+c^2>a^2

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  1. welshfella
    • one year ago
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    If cos theta > 0 then it must be an angle < or equal to 90 degrees

  2. anonymous
    • one year ago
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    so its either a or b?

  3. welshfella
    • one year ago
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    It cannot be b because that would make theta > 90 degrees

  4. welshfella
    • one year ago
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    B would be an obtuse angled triangle

  5. mathmath333
    • one year ago
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    u can use law of cosine here

  6. welshfella
    • one year ago
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    Note that a is a right angled triangle because of Pythagoras theorem so a would be an angle with a cosine > 0 but it does not have to be a right angled triangle for this to be the case

  7. welshfella
    • one year ago
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    Yes @matmat333

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