An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees. Visually, it appears as a wide angle that opens up more than a right angle (which is 90 degrees) but is still less than a straight line (which would be 180 degrees).
To recognize an obtuse angle, you can picture the hands of a clock. For example, when the minute hand is on the 12 and the hour hand is on the 5, the angle created between them is obtuse because it exceeds 90 degrees.
In geometric terms, when you have an obtuse angle, the two lines or rays that form the angle take up more space than they would if they formed a right angle. This makes the obtuse angle visually distinct from both acute angles (which are less than 90 degrees) and right angles (exactly 90 degrees).