**Explanation:**

A line is a one-dimensional geometric figure that extends infinitely in both directions. It is made up of an infinite number of points that are all equidistant from each other. Since a line extends infinitely, it does not have a definite or measurable length.

**Infinite Length:**

- A line has an infinite length because it has no endpoints and continues indefinitely in both directions.
- No matter how far you extend a line, you can always extend it further without reaching an endpoint.
- This infinite nature of a line makes it impossible to assign a definite or measurable length to it.

**Comparison to Line Segments:**

- It is important to note the difference between a line and a line segment.
- A line segment is a portion of a line that has two distinct endpoints.
- Unlike a line, a line segment has a definite and measurable length because it has endpoints that mark its boundaries.

**Mathematical Representation:**

- In mathematics, a line can be represented by a lowercase letter with an arrow on top (∞).
- This symbol indicates that the line extends infinitely in both directions.

**Conclusion:**

- In conclusion, a line does not have a definite length because it extends infinitely in both directions.
- It is an infinite geometric figure made up of an infinite number of points.
- The length of a line is considered indefinite, as it cannot be measured or assigned a specific value.

A line has no end points. The length of a line cannot be measured. A line has no definite length.