1, degree method: compare by comparing the degrees of angles. For example, compare the sizes of ∠A and ∠B. If the degree of ∠A is greater than that of ∠B, then ∠A is greater than ∠ B; On the other hand, ∠A is less than ∠ b.
2, radian method: by comparing the radian of the angle. For example, comparing the sizes of ∠A and ∠B, if the radian of ∠A is greater than that of ∠B, then ∠A is greater than ∠ B; On the other hand, ∠A is less than ∠ b.
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There are 10 angles in mathematics, namely: acute angle, right angle, obtuse angle, flat angle, rounded corner, negative angle, positive angle, upper angle, lower angle and zero angle.
Acute angle: refers to an angle (right angle) greater than 0 and less than 90, and an acute angle is a bad angle. The sum of the two acute angles is not necessarily greater than the right angle, but it must be less than the right angle.
Right angle: when the adjacent angles formed by a straight line and another horizontal straight line are equal, each of these angles is called a right angle, and this straight line is called perpendicular to another straight line.
Oblique angle: When the included angle between two straight lines is more than 90 degrees and less than 180 degrees, it is called obtuse angle. Oblique angle is a bad angle.
Flat angle: the light rotates around its endpoint. When the starting edge and the ending edge are on the same straight line and in opposite directions, the angle formed is called a straight angle.
Fillet: the angle formed by a ray rotating around its endpoint. Fillet is equal to 360, which is the angle formed when one side of the angle rotates around the vertex and coincides with the other side.
Negative angle and positive angle: when the terminal edge of the in-plane angle rotates around the vertex of the angle, it can have two different directions, one is counterclockwise and the other is clockwise, and the angle generated by counterclockwise rotation is defined as positive angle; The angle generated by clockwise rotation is defined as negative angle.
Excellent angle: also known as concave angle, refers to an angle larger than right angle (180) but smaller than rounded corner (360). Right angle, acute angle and obtuse angle are collectively called lower angle.
Lower angle: also known as convex angle, refers to an angle greater than 0 and less than180. Right angle, acute angle and obtuse angle are collectively called lower angle. An angle larger than a right angle (180) and smaller than a fillet (360) is called an upper angle (also called a concave angle).
Zero angle: the angle formed by light without rotation. The starting edge and the ending edge of the zero-degree angle coincide, but the angles at which the starting edge and the ending edge overlap are not all zero-degree angles, such as 360 degrees (2π radians) and -360 degrees (-2π radians).