Is a 0 degree angle acute or obtuse?
An angle is the result of rise over run as graphed on an intersecting x and y axis. The varying angles that are the result of the graph of rise over run, or y/x, all have different names. An angle that is a quarter turn, which would represent a direct intersection of the x and y axes, is called a right angle, or 90 degree angle. An angle which is less than 90 degrees, such as 0 degrees in your question, is called an acute angle. An angle that is a straight-line graph, that runs congruently with the x axis, is a straight angle, which represents 180 degrees. This angle also represents a half-turn, as it is one-half of a circle. An angle that is less than 180 degrees, but more than 90 degrees, is called an obtuse angle. An angle that represents three-quarters of a turn measures 270 degrees. And an angle that represents a whole turn, a complete revolution of the x and y axes, is 360 degrees, right back to the zero starting point we started with on the x axis.