Question

An obtuse triangle has :

• A. at least one obtuse angle.
• B. exactly one obtuse angle.
• C. atmost three obtuse angles.
• D. two obtuse angle.

Answer 1

The correct option is B 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.