anonymous
  • anonymous
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^2c^2 d-b^2+c^2>a^2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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welshfella
  • welshfella
If cos theta > 0 then it must be an angle < or equal to 90 degrees
anonymous
  • anonymous
so its either a or b?
welshfella
  • welshfella
It cannot be b because that would make theta > 90 degrees

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welshfella
  • welshfella
B would be an obtuse angled triangle
mathmath333
  • mathmath333
u can use law of cosine here
welshfella
  • welshfella
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
welshfella
  • welshfella
Yes @matmat333

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