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The electronic textbook of the first volume of mathematics in the sixth grade of primary school
There are four points, eight rays and six line segments on the same line.

There are four points on a straight line. There is only one straight line with four points, and each point has two rays and eight rays. Any two of these four points can have a line segment. * * * There are: 3+2+ 1=6 line segments.

Ray refers to a straight line formed by the infinite extension of one end of a line segment. Light has only one endpoint, and its length cannot be measured (infinite length).

A line segment means that both ends have endpoints and cannot be extended, which is different from straight lines and rays.

Extended data:

The difference between a ray segment and a straight line:

(1) Endpoint: A straight line has no endpoint; Ray has only one endpoint; A line segment has two endpoints.

(2) Extension: Both sides of a straight line can extend indefinitely; The other end of the ray endpoint can be extended indefinitely; The line segment cannot be extended.

(3) Measurement: Lines and rays cannot be measured, but line segments can be measured.

(4) It means: straight line: a line without end points; Ray: a line with only one end; Line segment: A line with endpoints at both ends.