An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees. It is larger than a right angle, which measures exactly 90 degrees. Obtuse angles can be found in various shapes and objects, such as triangles and polygons. In a triangle, if one angle is obtuse, the other two angles must be acute, meaning they each measure less than 90 degrees. Obtuse angles are commonly encountered in everyday life, such as in the design of furniture or architecture. For example, the angle between the backrest and seat of a chair can be obtuse, providing comfort for the user. Understanding obtuse angles is essential in fields like geometry and engineering.