StudyTheWorld
  • StudyTheWorld
Help! Will medal and fan! please helpp Suppose a triangle has sides a, b and c, and that a^2+b^2
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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StudyTheWorld
  • StudyTheWorld
1. (theta) is an obtuse triangle. 2. The triangle is not a right triangle. 3. The triangle is a right triangle. 4. cos(theta) < 0
StudyTheWorld
  • StudyTheWorld
@TrojanPoem Could you help on this one, too?
TrojanPoem
  • TrojanPoem
|dw:1446755346971:dw| \[\cos \theta = \frac{ a^2 + b^2 - c^2 }{ 2ab }\] a^2 + b^2 - c^2 < 0 costheta * 2ab = a^2 + b^2 - c^2 2abcostheta < 0 ( b, a are postive so we won't flip the sign) costheta < 0

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StudyTheWorld
  • StudyTheWorld
Okay I see. So answer 4 for sure
StudyTheWorld
  • StudyTheWorld
Answer 2, as well?
TrojanPoem
  • TrojanPoem
the triangle is obtuse too, as a^2 + b^2 < c^2 Notice that : a2 + b2 > c2 (acute) a2 + b2 = c2 ( right) a2 + b2 < c2 ( obtuse)
StudyTheWorld
  • StudyTheWorld
Okay, awesome! Thanks so much for helping me again!
TrojanPoem
  • TrojanPoem
Any time.
TrojanPoem
  • TrojanPoem
The triangle isn't a right triangle as it's obtuse.

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