True
False, because a triangle can have only 1 obtuse angle
true
In Euclidean geometry, a triangle must be one of these: acute, obtuse, or right. Maybe there is a non-Euclideangeometry for which some obtuse triangles can contain a right angle, but it doesn't happen in Euclidean geometry.
True. An obtuse angle is between 90 and 180 degrees.
true
False because it can have 1 obtuse angle and 2 acute angles providing that all 3 angles add up to 180 degrees.
False, because a triangle can have only 1 obtuse angle
true
In Euclidean geometry, a triangle must be one of these: acute, obtuse, or right. Maybe there is a non-Euclideangeometry for which some obtuse triangles can contain a right angle, but it doesn't happen in Euclidean geometry.
False
False
True
True. An obtuse angle is between 90 and 180 degrees.
false
False
true
True and all 3 angles must add up to 180 degrees.