Which Pair Of Undefined Terms Is Used To Define a Ray?

Which Pair Of Undefined Terms Is Used To Define a Ray?

A. Line and plane

B. Plane and line segment

C. Point and line segment

D. Point and line

Correct Answer: D. Point and Line

Explanation: 

A ray is a part of a line in geometry that has a beginning point and goes through a point infinitely in one direction. To define a ray, we will define two undefined terms (point & line).

A point is an exact location in space. A point has no size, length, or width; it is simply a spot, or a dot, to indicate a place. A line, on the other hand, is a straight path that extends infinitely in both directions through an infinite number of points. Both point and line are called "undefined" because they are so simple that they are not defined using other words. These two words will be the building blocks to define all other geometric figures.

A ray begins at a point, known as the endpoint. From that point, it travels in one direction along a line. If a ray begins at point A and travels through point B, we call it ray AB. It has its starting point, closely known as endpoint A, and it extends infinitely in the direction of point B.

Terms such as plane or line segment are also included in the study of geometry but are not used with regard to ray. A line segment has two endpoints, and a plane is a flat surface which extends in all directions, contrary to a ray.

Thus, the answer is D. Point and Line, since these are the terms which are essential in the definition of a ray.