In geometry, an angle is a geometric object composed of two rays with a common endpoint. These two rays are called the edges of an angle, and their common endpoint is called the vertex of the angle. The general angle is assumed to be in Euclidean plane, but it can also be defined in Euclidean geometry. Angle is widely used in geometry and trigonometry.
Extended data:
Type of horn:
Acute angle: An angle greater than 0 and less than 90 is called an acute angle.
Right angle: An angle equal to 90 is called a right angle.
Oblique angle: an angle greater than 90 and less than180 is called obtuse angle.
Right angle: An angle equal to 180 is called a right angle.
Large angle: an angle greater than180 and less than 360 is called a large angle.
Small angle: more than 0 and less than 180 is called small angle, and acute angle, right angle and obtuse angle are all small angles.
Fillet: An angle equal to 360 is called a fillet.
Negative angle: the angle formed by clockwise rotation is called negative angle.
Baidu encyclopedia-jiao