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Line and point
A Ray in geometry is a line starting at some point (called the endpoint) and moving infinitely in one direction. The pair of undefined terms used to define a ray is are Line and a point.
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There are three undefined terms in geometry with them being Point, Line, and Plane. These three terms make up the basis of all geometry.
Undefined terms are the base building blocks of Geometry. They are the most basic aspects of the subject, to the point that no definition can clearly define them. After all, every definition in geometry is based upon them. Instead, we use our intuition to understand their properties and use them.
A Ray has a single Endpoint and then extends straight in a single direction infinitely. A line segment, on the other hand, has two end points; hence, it has a finite and measurable length.
Yes, two rays with the same starting point can be identical, given that they have the same direction. Otherwise, they would not be identical but create two distinct rays that might have an angle between them.
Yes. When two rays share a common endpoint, they form an angle. The shared point is called the vertex of the angle, and the rays are the sides