The undefined term that is used to define and describe a ray is called line.
What is a ray in Geometry?
In Geometry, a ray is that part of a line that has a determinate initial starting point but no terminal endpoint. The ray is usually used in vector forms to identify points, in which one of the points is fixed and the other is infinite.
An example of a ray can be seen from the light that emanates from the sun. The symbol used for the identification of ray is: →
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