An acute angle is less than 90°. An obtuse angle is between 90° and 180°. A reflex angle is between 180° and 360°. These are all right angles as they are all a quarter turn (90°).

Watch this video to learn about acute, obtuse, right and reflex angles. An angle is the space between two lines that start at the same point and you measure them in degrees. Angles can be between ...