In this module, you can study how angles are formed, the names of types and parts of angles, and how to measure angles using a protractor.
The number of degrees in an angle is unrelated to the length of its lines.
An angle's size has nothing to do with the direction the angle is facing.
Study and practice
A circle has 360
A straight line is 180
A right angle is 90
An acute angle is less than 90
An obtuse angle is between 90 - 180
i.e. greater than 90 and less than 180
A reflex angle is between 180 - 360
i.e. greater than 180 and less than 360