Is the horizontal angle an obtuse angle? Is the obtuse angle a horizontal angle?

Is the horizontal angle an obtuse angle? Is the obtuse angle a horizontal angle?


Flat angle is obtuse angle, obtuse angle is not flat angle
A flat angle is an angle of 180 degrees
An obtuse angle is an angle less than 180 and greater than 90 degrees



Judge that a horizontal angle is a straight line () an angle greater than 90 degrees is an obtuse angle () an obtuse angle must be greater than a right angle ()


Flat angle is a straight line (wrong)
An angle greater than 90 degrees is obtuse
An obtuse angle must be greater than a right angle



What is the difference between the horizontal angle and the obtuse angle


Acute angle