Acute Angle
Right Angle
Obtuse Angle
Straight Angle
Reflex Angle
Full Angle
Picture
Definition
An acute angle measures less than 90 degrees. Think of this: it's such "a cute" little angle!
A right angle is an angle that measures exactly 90 degrees.
A reflex angle measures greater than 180 degrees, but less than 360 degrees.
A straight angle measures exactly 180 degrees. It doesn't even look like an angle, but rather a line.
A full angle measures exactly 360 degrees.
An obtuse angle is greater than 90 degrees, but less than 180 degrees.