That is called a ray...
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The simplest geometric concept is an item that has no dimensions = a point. The next simplest is an item that has only one dimension = a straight line. The next simplest is an item that covers area but only needs one number to completely describe it . . . a circle.
The simplest geometric concept is an item that has no dimensions = a point. The next simplest is an item that has only one dimension = a straight line. The next simplest is an item that covers area but only needs one number to completely describe it . . . a circle.
In geometric terms, a line can have only one slope. if there is more than one slope, it is not a line, it is multiple lines or a second (or higher) order graphical representation of a function in two dimensional space.
A sphere
Any geometric figure