Yes.
The sum of all three [interior] angles of a triangle is 180 degrees. So at most one of the can be obtuse (more than 90 degrees). If two were obtuse, they would sum to more than 180 degrees and then, if all three sum to 180, the third angle would have to have negative measure.
No
any triangle can contain at most 1 obtuse angle. it is called an obtuse triangle.
A triangle can have at most one obtuse angle, but triangles do not necessarily have any obtuse angles.
obtuse triangle
I assume that the second use of the word "triangle" in the question should be angle. An obtuse triangle must have two acute angles.
True
In an obtuse triangle, one angle is obtuse and the other two are acute. "The buildings are arranged in an obtuse triangle and occupy most of the long, thin parcel of land."
If you are classifying triangles by their angles, an obtuse triangle has one obtuse angle and two acute angles. A triangle can have at most one obtuse angle. If the two acute angles are congruent, the triangle would also be isosceles.
an Obtuse triangle
An obtuse triangle.
An obtuse triangle
-- No right triangle, acute triangle, or equilateral triangle has an obtuse angle in it. -- If a triangle has an obtuse angle in it, then it's called an obtuse triangle. -- No triangle can have more than one obtuse angle in it .