angle
two rays that share an endpoint
An angle is a figure formed by two rays with a common endpoint. The common endpoint is called the vertex of the angle, and the two rays are called the sides of the angle. The degree of an angle is the measure of the degree of rotation between its two sides, and it is usually denoted by the symbol °. An angle of 90° is called a right angle, an angle of 180° is called a straight angle, and an angle of 360° is called a full angle or a circle. The measurement of an angle can be done using a protractor, and it can be expressed in degrees, radians, or grads. Angles are used extensively in mathematics, physics, engineering, and many other fields to represent the orientation, direction, and magnitude of various physical phenomena.
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