Question

which of the following is an example of an undefined notion? (1 point)
a line is an example of an undefined notion.
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.

Explanation:

In geometry, point, line, and plane are undefined notions. They are concepts that are not formally defined in terms of simpler 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 that are at a given distance from a given point (the center), and a line - segment is defined as a part of a line that is bounded by two distinct end - points.

Answer:

A. A line is an example of an undefined notion.