What is a line segment? A straight line with two endpoints is called a line segment.

As shown in the figure below:

Look straight at blue, yellow and red ***3.

And there are two or more:

It consists of two articles:

Blue and yellow make up one, yellow and red make up another, ***2.

It consists of three stripes and 1 stripes composed of blue, yellow and red.

So there are six line segments in this diagram.

Calculation formula: 3+2+ 1=6 (strips)