This can be done in several ways:
We can tell which line segment is greater than other just by observing the two line segments but it is not sure.
Here, we can clearly say that but sometimes it is difficult to tell which one is greater.
In this method we have to trace one line on paper then put the traced line segment on the other line to check which one is greater.
But this is a difficult method because every time to measure the different size of line segment we have to make a separate line segment.
We can use a ruler to measure the length of a line segment.
Put the zero mark at point A and then move forward l to measure the length of the line segment. But it may have some errors on the basis of the thickness of the ruler.
This could be made accurate by using a Divider.
There are four main directions. They are North, South, East and West.
The turn from north to east is by a right angle. The turn from north to south is by two right angles. It is called a straight angle. If, we turn two straight angles or four right angles in the same direction, then it makes a full turn and we reach our original position. This one complete turn is called one revolution. The angle for one revolution is a complete angle.
We can see such revolution on clock faces. When the hand of clock moves from one position to another, it turns through an angle. Suppose the hand of a clock starts at 12 and goes around until it reaches 12 again. Clearly, it has made one revolution. It has turned through one complete angle or two straight angles or four right angles.