An angle that is less than 90 degrees is called an acute angle. In geometry, an acute angle is any angle that measures less than 90 degrees. Acute angles are commonly found in triangles and other shapes, and are often used in calculations and measurements.

Acute angles are important in geometry because they help us understand the relationships between different shapes and figures. They can be found in various everyday objects and situations, such as the corners of a square or the pitch of a roof. Understanding acute angles can help us solve problems involving angles, distances, and shapes.

One way to identify an acute angle is to look for the small angle symbol, which is a small arc placed in the corner of the angle. This symbol indicates that the angle is less than 90 degrees. Acute angles can also be identified by their shape – they are typically sharp and pointed, rather than open or wide.

Acute angles are contrasted with obtuse angles, which are angles that measure more than 90 degrees but less than 180 degrees. While acute angles are sharp and narrow, obtuse angles are open and wide. By understanding the differences between acute and obtuse angles, we can better analyze and solve geometric problems.

In summary, an angle that is less than 90 degrees is called an acute angle. Acute angles are important in geometry and can be found in various shapes and objects. By understanding acute angles, we can improve our ability to solve problems and make calculations involving angles and shapes.

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