The awsomeness of...
An angle that is less than 90 degrees (smaller than a right angle)!
A angle that is exactly 90 degrees!
An angle that is bigger than 90 degrees ( bigger than a right angle) less than 180 degrees (smaller than a straight angle)!
and angle that is exactly 180 degrees!
A circle is exactly 360 degrees!
A quadrilateral no matter how wierd it is shaped if it has four sides it will always lead up to 360 degrees