An obtuse angle or a reflex angle.
One pair of opposite angle is greater than a right angle.
It is a triangle
In general, a triangle doesn't need to have any angle greater than a right angle, but if it does, it can only have one.
Yes. The sum of the angles in a triangle is 180° All angles in a triangle must be greater than 0° which means that the sum of any two angles must be less than 180° If two angles are right angles (90°), their sum is 180° which is not less than 180°; thus at most one angle can be a right angle. If one angle is a right angle and another is an obtuse angle (greater than 90°), then their sum is greater than 180°, which is not less than 180°; thus there can be at most one of a right angle and an obtuse angle. If two angles are obtuse angles, their sum is greater than 180°, which is not less than 180°; thus there can be at most one obtuse angle. If there is at most one right angle or an obtuse angle, there must be at least two acute angles.
No. Right triangles are triangles with one angle exactly 90°, and obtuse angles are triangles with exactly one angle that is greater than, but not equal to, 90°.
An obtuse angled triangle, or more simply, an obtuse triangle.
An obtuse triangle has one angle greater than 90 degrees and a right triangle has one angle exactly 90 degrees.
Not really because if one of the angles between two planes is greater than 90 degrees then the other (adjacent) will by smaller.
A reflex angle is one greater than 180o
No angle has a sine function greater than 1.