How many line segments are there in Figure 3-5?

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Answer: (1) We know that the straight line between two points is a line segment. The line segments with point A as the same endpoint are:

Aba，AC，AB AC AD AE AF 5。

The line segment whose point B is * * * and whose left end point is the same is:

The article in 2000 BC was BF 4.

The line segment whose point C is * * * and whose left end point is the same is:

Article CD CE CF 3

The line segment whose point D is * * * and whose left end point is the same is:

DE DF 2

The line segment whose point E is * * * and whose left end point is the same is:

EF 1。

The total is 5+4+3+2+ 1= 15.

To sum up, this question examines graphic counting.