Obtuse Angle
) and less than 
).
See also
Acute Angle, Full Angle, Obtuse Triangle, Reflex Angle, Right Angle, Straight Angle Explore this topic in the MathWorld classroomExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Obtuse Angle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ObtuseAngle.html