Question

points, lines, and planes quick check
which of the following is an example of an undefined notion? (1 point)
an angle is an example of an undefined notion.
a circle is an undefined notion.
a line segment is an example of an undefined notion.
a line is an example of an undefined notion.

Explanation:

In geometry, points, lines, and planes are undefined notions. They are basic concepts that are not formally defined in terms of other geometric concepts. An angle is defined in terms of two rays sharing a common endpoint, a circle is defined as the set of all points in a plane at a given distance from a given point, and a line - segment is part of a line with two endpoints.

Answer:

A line is an example of an undefined notion.