I'm a teacher. What's the angle between 180 degrees and 360 degrees

I'm a teacher. What's the angle between 180 degrees and 360 degrees

[excellent actor]
The angle greater than the horizontal angle and less than the circumference angle is called the superior angle. As shown in the figure, AOB is the superior angle
[right angle, acute angle, obtuse angle, superior angle, inferior angle]
Half of a horizontal angle is called a right angle, which is represented by "┓" when drawing. A right angle is 90 degrees. An angle less than a right angle is called an acute angle, and an acute angle greater than 0 degrees is less than 90 degrees. An angle greater than a right angle but less than a horizontal angle is called an obtuse angle, and an obtuse angle greater than 90 degrees but less than 180 degrees. An angle less than a horizontal angle is called a inferior angle, and an acute angle, a straight angle, and an obtuse angle are inferior angles. An angle greater than a horizontal angle but less than a peripheral angle is called a superior angle, and an angle greater than 180 degrees but less than 360 degrees
In Teaching: (1) in primary schools, only the names of acute angle, right angle, obtuse angle, flat angle and perimeter angle are generally given, which can be understood on the basis of measuring angle. First measure the right angle (90 degrees), and then lead to other angles. (2) through the demonstration of activity model and actual measurement, students can know the degree range of various angles and the relationship between various angles, or use origami method, Let students understand the relationship between horizontal angle and right angle, and between perimeter angle and right angle

Who knows why a circle is defined as 360 degrees? Who defines it?

The reason why the circle is set at 360 degrees is that the ancient Egyptians believed that 360 days is a year (although it is different from the reality), and the time of a year is just the time to observe the cycle of the ecliptic. Moreover, the ancients used a simple philosophical unified view that 360 is a constant in the world, so later