Question

to indicate that a line continues indefinitely in both directions, what is drawn at the ends of the line? vertical bars open circles endpoints arrows

Explanation:

In geometry, arrows at the ends of a line are used to show that the line extends infinitely in both directions. Vertical bars are not standard for this purpose. Open circles are often used in number - line contexts for inequalities (e.g., not including a point). Endpoints are used for line segments (which have a definite length).

Answer:

Arrows