Definition
An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees. It is wider and more open than a right angle.
An obtuse angle opens wider than a square corner. If you lean back in a chair past the upright position, the angle between the back and the seat becomes obtuse.
Examples
- A 120-degree angle is obtuse.
- A 150-degree angle is obtuse.
- A reclining chair can form an obtuse angle.