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Question

An obtuse triangle has : 
  1. two obtuse angle.
  2. at least one obtuse angle.
  3. exactly one obtuse angle.
  4. atmost three obtuse angles.


Solution

The correct option is C exactly one obtuse angle.
An obtuse triangle is a triangle in which one of the angles is an obtuse angle.
Obviously, only a single angle in a triangle can be obtuse or it wouldn't be a triangle.
Hence, only one obtuse angle can be possible.

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