Question

Which of the following is not an undefined term?

point
ray
line
plane

Answer 1

Ray is the answer. A ray is a line a with a start point but no endpoint. It goes on for infinity.

Answer 2

Answer: A ray is not an undefined term.

Explanation:

There are three undefined terms in geometry which are used to defined other terms in it.

i) A point (no dimension) ii) A line (one dimension) iii) A Plane (two dimension)

• In geometry, A ray is defined as a line with one fixed point or beginning point and from there it is extended up to infinity.

Therefore a ray is not an undefined term because it can be defined by using a point and a line.