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Angles are usually represented by symbols.
The following is an explanation about "corners are usually represented by symbols":

The angle is usually represented by the symbol "∞". This symbol can be used to indicate an angle or the size of an angle.

An angle is a figure composed of two straight lines or rays with the same endpoint. These two lines or rays are called the edges of an angle, and this endpoint is called the vertex of the angle. In geometry, angles can be divided into different types, such as right angle, acute angle and obtuse angle. These different types of angles have different degrees and characteristics.

A right angle is a special angle, its degree is 90 degrees, and its two sides are perpendicular to each other. An acute angle is an angle smaller than a right angle, the degree is between 0 and 90 degrees, and both sides are bent inward. An obtuse angle is an angle greater than a right angle, and its degree is between 90 degrees and 180 degrees, and both sides are bent outward.

In mathematics and geometry, we often use the concept of angle. For example, when we need to calculate the angle difference or the sum of two angles, we need to use the concept of angle. At the same time, when solving some geometric problems, we also need to determine the shape and size of some line segments or graphics by calculating the angle.

The degree of an angle is usually expressed in degrees, where the right angle is 90 degrees, the acute angle is between 0 and 90 degrees, and the obtuse angle is between 90 degrees and 180 degrees. In mathematics and geometry, angle is an important quantity used to describe the size and position of angle. By calculating angles, we can determine the relationship between angles, such as the angle difference between two angles or the sum of two angles.

At the same time, angle is also an important tool to solve some geometric problems, such as calculating the angle in a triangle or determining the internal angle of a quadrilateral. In a word, the concept of angle and the expression of degree are basic concepts in mathematics and geometry, which are very important for understanding geometric figures and solving geometric problems.

In a word, angle is a basic geometric concept, which is represented by the symbol "∞". By understanding the characteristics and degrees of different types of angles, we can better understand and solve the mathematical and geometric problems related to angles.