Question

which figure represents an undefined term?

Explanation:

In geometry, the three undefined terms are point, line, and plane. The first option represents a ray (a part - of a line with one endpoint and extends infinitely in one direction), the second is a line - segment (a part of a line with two endpoints), the third is an angle (formed by two rays with a common endpoint), and the fourth is a line (extends infinitely in both directions). A line is an undefined term.

Answer:

The fourth figure (the one with two arrow - heads indicating it extends infinitely in both directions)